Tootfinder

Tunable spin-phonon polarons in a chiral molecular qubit framework
Aimei Zhou, Ruihao Bi, Zhenghan Zhang, Luming Yang, Xudong Tian, Denan Li, Mingshu Tan, Weibin Ni, Haozhou Sun, Jinkun Guo, Xinxing Zhao, Zhifu Shi, Wei Tong, Zhitao Zhang, Jin-Hu Dou, Feng Jin, Shi Liu, Mircea Dinca, Tijana Rajh, Jian Li, Wenjie Dou, Lei Sun
https://

Tunable spin-phonon polarons in a chiral molecular qubit framework
Chiral structures that produce asymmetric spin-phonon coupling can theoretically generate spin-phonon polarons -- quasiparticles exhibiting non-degenerate spin states with phonon displacements. However, direct experimental evidence has been lacking. Using a chiral molecular qubit framework embedding stable semiquinone-like radicals, we report spin dynamic signatures that clearly indicate the formation of spin-phonon polarons for the first time. Our non-adiabatic model reveals that these quasipa…

Designer polyradical nanographenes with strong spin entanglement and perturbation resilience via Clar's goblet extension
En Li, Manish Kumar, Xinnan Peng, Tong Shen, Diego Soler-Polo, Yu Wang, Yu Teng, Haoyu Zhang, Shaotang Song, Jishan Wu, Pavel Jelinek, Jiong Lu
https://arxiv.org/abs/2506.05181

Designer polyradical nanographenes with strong spin entanglement and perturbation resilience via Clar's goblet extension
Polyradical nanographenes featuring strong spin entanglement and robust many-body spin states against external magnetic perturbations not only enable the exploration of correlated quantum magnetism at the molecular scale, but also constitute promising candidates for developing molecular qubits with chemical tunability and building scalable quantum networks. Here, we employed a predictive design strategy to achieve the on-surface synthesis of two homologues of Clar goblet, C62H22 and C76H26, via…

This https://arxiv.org/abs/2502.20044 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Spin 1 Transverse Momentum Dependent Tensor Structure Functions in CLAS12
We propose to analyze CLAS12 RG-C data to study the tensor transverse-momentum-dependent parton distribution functions (TMDs) on deuteron data. The deuteron is the lightest nucleus with spin-1, in essence a weakly bound system of two spin-1/2 nucleons. However, one of the most intriguing characteristics of the deuteron is that the tensor polarized structure provides direct access to the quark and gluon distribution of light nuclear system, which cannot be naively constructed from the proton and…

I had to change both tires on the 50 year old Raleigh and it was a bit of a pain but it’s up and rolling again. Too hot to ride now though… might give it a spin in the morning.
#bikes #bikeTooter

This https://arxiv.org/abs/2505.15724 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Gravitational Bremsstrahlung in Black-Hole Scattering at $\mathcal{O}(G^3)$: Quadratic-in-Spin Effects
We are employing a supersymmetric variant of the worldline quantum field theory (WQFT) formalism to compute the far-field momentum-space gravitational waveform emitted during the scattering of two spinning black holes at next-to-leading order (NLO) in the post-Minkowskian expansion. Our results are accurate up to quadratic-in-spin contributions, which means we report for the very first time the waveform observable at the order $\mathcal{O}(G^3\mathcal{S}^2)$. Our computation is based on mapping…

Spin waves in Na$_2$Co$_2$TeO$_6$ studied by high-frequency/high-field ESR: Successes and failures of the triple-$\mathbf{q}$ model
Luca Bischof, Jan Arneth, Raju Kalaivanan, Raman Sankar, Kwang-Yong Choi, R\"udiger Klingeler
https://arxiv.org/abs/2506.03789

Spin waves in Na$_2$Co$_2$TeO$_6$ studied by high-frequency/high-field ESR: Successes and failures of the triple-$\mathbf{q}$ model
The Kitaev candidate material Na$_2$Co$_2$TeO$_6$ is proposed to be proximate to a quantum spin liquid state but a suitable spin model and the nature of its ground states are still under debate. Our high-frequency/high-field electron spin resonance spectroscopy studies of Na$_2$Co$_2$TeO$_6$ single-crystals under in-plane and out-of-plane magnetic fields elucidate the ground state by investigating its low-energy spin wave excitations. Several excitation modes are observed in the low-field phase…

Kondo effect under arbitrary spin-momentum locking
Kinari Goto, Yusuke Nishida
https://arxiv.org/abs/2506.04792 https://arxiv.org/pdf…

Kondo effect under arbitrary spin-momentum locking
The Kondo effect originates from the spin exchange scattering of itinerant electrons with a localized magnetic impurity. Here, we consider generalization of Weyl-type electrons with their spin locked on a spherical Fermi surface in an arbitrary way and study how such spin-momentum locking affects the Kondo effect. After introducing a suitable model Hamiltonian, a simple formula for the Kondo temperature is derived with the second-order perturbation theory, which proves to depend only on the spi…

This https://arxiv.org/abs/2503.03758 has been replaced.
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Classical periodic orbits in extended phase space for spherical harmonic oscillator with spin-orbit coupling
A complete analysis of classical periodic orbits (POs) and their bifurcations was conducted in spherical harmonic oscillator system with spin-orbit coupling. The motion of the spin is explicitly considered using the spin canonical variables derived by semiclassical approximation to the spin coherent state path integral representation. In addition to the diametric and two circular PO families with frozen spin, solutions that bridge two circular POs are found in which orbital motion is coupled to…

This https://arxiv.org/abs/2505.17212 has been replaced.
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Engineering Altermagnetism via Layer Shifts and Spin Order in Bilayer MnPS$_3$
We investigate how stacking configuration and magnetic ordering determine the magnetic phases of bilayer MnPS$_3$, using density-functional theory and spin-Laue symmetry analysis. While monolayer MnPS$_3$ is a collinear antiferromagnet with no spin splitting, our calculations show that the bilayer can host either Type II (AFM) or Type III (altermagnetic) phases depending sensitively on stacking and spin alignment. We focus on two representative stackings: AA, where the top layer sits directly a…

Tailoring the resonant spin response of a stirred polariton condensate
Ivan Gnusov, Alexey Yulin, Stepan Baryshev, Sergey Alyatkin, Pavlos G. Lagoudakis
https://arxiv.org/abs/2506.03953

Tailoring the resonant spin response of a stirred polariton condensate
We report on the enhancement of the spin coherence time (T2) by almost an order-of-magnitude in exciton-polariton condensates through driven spin precession resonance. Using a rotating optical trap formed by a bichromatic laser excitation, we synchronize the trap stirring frequency with the condensate intrinsic Larmor precession, achieving an order of magnitude increase in spin coherence. By tuning the optical trap profile via excitation lasers intensity, we precisely control the resonance widt…

Classification of spin$^c$ manifolds with generalized positive scalar curvature
Boris Botvinnik, Paolo Piazza, Jonathan Rosenberg
https://arxiv.org/abs/2507.02090

Classification of spin$^c$ manifolds with generalized positive scalar curvature
Suppose $M$ is a closed $n$-dimensional spin$^c$ manifold with spin$^c$ structure $σ$ and associated spin$^c$ line bundle $L$. If one fixes a Riemannian metric $g$ on $M$ and a connection $\nabla_L$ on $L$, the generalized scalar curvature $R^{\text{gen}}$ of $(M,L)$ is $R_g - 2|Ω_L|_{\text{op}}$, where $|Ω_L|_{\text{op}}$ is the pointwise operator norm of the curvature $2$-form $Ω_L$ of $\nabla_L$, acting on spinors. In a previous paper, we showed that positivity of $R^…

Spin refinement of moduli spaces of residueless meromorphic differentials and the BKP hierarchy
David Klompenhouwer, Stijn Velstra
https://arxiv.org/abs/2506.02540

Spin refinement of moduli spaces of residueless meromorphic differentials and the BKP hierarchy
We consider strata of curves carrying a residueless meromorphic differential inducing a spin structure on the curve. The cohomology classes of the closures of these strata, weighted by the parity of the spin structures, form a partial cohomological field theory (CohFT) of infinite rank. After applying the DR hierarchy construction to this partial CohFT and reducing to differentials with two zeros and arbitrarily many poles, we show that the resulting system of evolutionary PDEs coincides with t…

Axial quasi-normal modes of slowly rotating black holes in dynamical Chern-Simons gravity to second-order in spin and coupling
Tharaka Alapati (IIT Bombay), S. Shankaranarayanan (IIT Bombay)
https://arxiv.org/abs/2506.03600

Axial quasi-normal modes of slowly rotating black holes in dynamical Chern-Simons gravity to second-order in spin and coupling
We compute the quasi-normal mode (QNM) frequencies of slowly rotating black holes in dynamical Chern-Simons (dCS) gravity, including corrections up to second order in the black hole's dimensionless spin parameter ($χ$) and second order in the dCS coupling parameter ($α$). Due to the complexities of constructing a Newman-Penrose tetrad at this order, we employ a metric perturbation approach. We derive a system of coupled ordinary differential equations for the primary axial $l$-mode and the po…

Experimental Study of Tensor Structure Function of Deuteron
Jiwan Poudel, Alessandro Bacchetta, Jian-Ping Chen, Nathaly Santiesteban
https://arxiv.org/abs/2506.04506

Experimental Study of Tensor Structure Function of Deuteron
The deuteron is the lightest spin-1 nucleus, consisting of a weakly bound system of two spin-1/2 nucleons. One intriguing characteristic of the deuteron is the tensor polarized structure, which cannot be naively constructed combining the proton and neutron structure. The tensor structure of the deuteron provides unique insights into the quarks and gluons distributions and their dynamics within the nucleus. It can be studied experimentally through inclusive and semi-inclusive Deep Inelastic Scat…

Polarized Neutrons at ISIS: Recent Developments And Highlights
Polly Mitchell, Holly I. Barnfield, Mark Devonport, Kirill Nemkovski, G{\o}ran J. Nilsen, Peter Galsworthy, Gavin B. G. Stenning
https://arxiv.org/abs/2506.05148

Polarized Neutrons at ISIS: Recent Developments And Highlights
We present two recent projects which aim to improve the performance of polarized neutron scattering experiments using hyperpolarized $^{3}He$ spin filters at ISIS. The first is the optimization of a new compact magnetostatic cavity ("Magic Box") to house the $^{3}He$ spin filters based on an existing design. With a length of only 380 mm, it provides a field gradient relaxation time for the $^{3}He$ cell of 421 h in ambient conditions. It also contains a radiofrequency coil for adiabatic fast pa…

Superradiant Echoes Induced by Multiple Re-phasing of NV Spin Sub-ensembles Grating at Room Temperature
Qilong Wu, Yuan Zhang, Huihui Yu, Chong-Xin Shan, Klaus M{\o}lmer
https://arxiv.org/abs/2507.01328

Superradiant Echoes Induced by Multiple Re-phasing of NV Spin Sub-ensembles Grating at Room Temperature
In this Letter, we propose that superradiant echoes can be achieved at room temperature by applying a laser illumination and a microwave Hahn echo sequence to a diamond with a high concentration of nitrogen-vacancy (NV) centers placed in a dielectric microwave cavity. We identify that the combined action of two microwave driving pulses and a free evolution imprints a phase grating among NV spin sub-ensembles in frequency space, and multiple re-phasing of the grated spin sub-ensembles leads to m…

Spin Systems Coupled to Photons: A Case study of Phase Transition in a One-Dimensional Classical Ferromagnetic Ising Spin Chain at Finite Temperature
Shuntaro Otake, Motoaki Bamba
https://arxiv.org/abs/2507.01486

Spin Systems Coupled to Photons: A Case study of Phase Transition in a One-Dimensional Classical Ferromagnetic Ising Spin Chain at Finite Temperature
Although one-dimensional classical spin chains do not exhibit phase transitions, we found that a phase transition does occur when they are coupled to a cavity photon mode. This provides one of the simplest examples demonstrating that finite-temperature superradiant phase transitions can emerge from long-range fully connected interactions mediated by photons and interactions within the material.

Internet hive mind: are 12V BLDC fans (PC case fans etc) likely to be permanently harmed by sustained undervoltage? In particular an hour or more a day at voltages low enough that they don't spin up but make audible coil whine.

As web developer I am interested in learning more about Spritely Goblins but I think I need a better starter guide then this.
Would love to spin it up on DigitalOcean or Github codespace and play with some code and see if I could build something.
https://files.spritely.…

On the Discontinuous Breaking of Replica Symmetry and Shattering in Mean-Field Spin Glasses
Antonio Auffinger, Ahmed El Alaoui, Mark Sellke
https://arxiv.org/abs/2506.02238

On the Discontinuous Breaking of Replica Symmetry and Shattering in Mean-Field Spin Glasses
We show that in mean-field spin glasses, a discontinuous breaking of replica symmetry at the critical inverse temperature $β_c$ implies the existence of an intermediate shattered phase. This confirms a prediction from physics regarding the nature of random first order phase transitions. On the other hand, we give an example of a spherical spin glass which exhibits shattering, yet the transition is continuous at $β_c$.

This https://arxiv.org/abs/2503.15398 has been replaced.
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Separation of variables for higher rank integrable models: review of recent progress
Separation of variables (SoV) is a powerful method expected to be applicable for a wide range of quantum integrable systems, from models in condensed matter physics to gauge and string theories. Yet its full implementation for many higher rank examples, such as SU(N) spin chains with N>2, has remained elusive for a long time. In this pedagogical review we discuss the major progress achieved recently in understanding SoV for models of this type. In particular, for rational SU(N) spin chains we d…

Emergent gravity and gravitational lensing in quantum materials
Yugo Onishi, Nisarga Paul, Liang Fu
https://arxiv.org/abs/2506.04335 https://

Emergent gravity and gravitational lensing in quantum materials
We show that an effective gravitational field naturally emerges in quantum materials with long-wavelength spin (or pseudospin) textures. When the itinerant electrons' spin strongly couples to the background spin texture, it effectively behaves as a spinless particle in a curved space, with the curvature arising from quantum corrections to the electron's spin orientation. The emergent gravity gives rise to the electron lensing effect, an analog of the gravitational lensing. Our work shows that n…

K2 observations of five pulsating subdwarf B stars with white dwarf companions
M. D. Reed, A. S. Baran, J. H. Telting, R. H. Ostensen, C. S. Jeffery, Y. Gaibor
https://arxiv.org/abs/2506.05033

K2 observations of five pulsating subdwarf B stars with white dwarf companions
We report seismic analyses of five pulsating subdwarf B (sdBV) stars observed during Kepler's K2 mission, each with a white dwarf companion. We find three of the five to be g-mode-dominated hybrid pulsators. For the other two, we only detect g modes. We determine rotation periods from frequency multiplets for four stars and each rotates subsynchronously to its binary period, including PG 0101+039 and PG 0902+124 both with binary periods near 0.57 days and spin periods near 9 days. We detect fre…

Application range of perfect spin hydrodynamics
Zbigniew Drogosz, Wojciech Florkowski, Valeriya Mykhaylova
https://arxiv.org/abs/2506.01537 https://…

Application range of perfect spin hydrodynamics
The application range of perfect spin hydrodynamics is studied in two cases: one based on the classical spin description and the other using a quantum spin density matrix (Wigner function). Different forms of the conditions connecting the components of the spin polarization tensor, particle mass, temperature, and hydrodynamic flow are introduced, and their mutual relations are explained. The results obtained are important for practical applications of spin hydrodynamics to model heavy-ion colli…

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
Seth Nelson, Cong Yu, Daniel Watson, Shahrzad Ramtinfard, Miguel Levy
https://arxiv.org/abs/2507.02093

Optical Vortex Spin-Orbit Control of Refractive Index in Iron Garnets
The interaction between light's angular momentum (AM) and material systems has unlocked new avenues in structured photonics, including in magneto-optical (MO) materials. While spin angular momentum (SAM) effects in MO systems are well-established, orbital angular momentum (OAM) introduces novel opportunities for new nonreciprocal light-matter interactions. In this study, we demonstrate a unique optical phenomenon where OAM states undergo state-specific nonreciprocal operation within an MO mediu…

This https://arxiv.org/abs/2503.09695 has been replaced.
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Modified large-$N$ approach to gapless spin liquids, magnetic orders, and dynamics: Application to triangular lattice antiferromagnets
Recent work has shown that the triangular lattice spin-$1/2$ $J_1$-$J_2$ Heisenberg and XXZ antiferromagnets may exhibit coplanar or supersolid orders proximate to a gapless Dirac spin liquid phase. We explore a distinct $SU(2N)\!\!\times\!\!SU(M)$ fermionic parton approach, complemented by variational Monte Carlo calculations for the spin-$1/2$ model, to study the phase diagram of these models. We also calculate their dynamical spin response including parton interactions within a random phase …

Exponential decay in $O(n)$-invariant quantum spin systems
Jakob E. Bj\"ornberg, Kieran Ryan
https://arxiv.org/abs/2506.22254 https://

Exponential decay in $O(n)$-invariant quantum spin systems
We consider $O(n)$-invariant and reflection-positive quantum spin systems on the integer lattice in any dimension, and prove that spin-spin correlations decay exponentially fast provided n is large enough. This answers a question of Ueltschi, who proved that for small n there is instead long-range order (for d at least 3).

Itinerant versus localized magnetism in spin gapped metallic half-Heusler compounds: Stoner criterion and magnetic interactions
E. Sas{\i}oglu, W. Beida, S. Ghosh, M. Tas, B. Sanyal, S. Lounis, S. Blugel, I. Mertig, I. Galanakis
https://arxiv.org/abs/2506.03416

Itinerant versus localized magnetism in spin gapped metallic half-Heusler compounds: Stoner criterion and magnetic interactions
Spin gapped metals have recently emerged as promising candidates for spintronic and nanoelectronic applications, enabling functionalities such as sub-60mV/dec switching, negative differential resistance, and non-local spin-valve effects in field-effect transistors. Realizing these functionalities, however, requires a deeper understanding of their magnetic behavior, which is governed by a subtle interplay between localized and itinerant magnetism. This interplay is particularly complex in spin g…

Collective excitation spectra of dipolar bosonic fractional quantum Hall states
Moumita Indra, Pankaj Kumar Mishra
https://arxiv.org/abs/2506.05085 https:/…

Collective excitation spectra of dipolar bosonic fractional quantum Hall states
We numerically investigate the collective excitation of spin-conserving and spin-reversed configuration of rotating diluted ultra-cold dipolar Bose gas. Rotating trapped Bose gas produces a fictitious magnetic field perpendicular to the trapping harmonic potential, which exhibits strongly correlated fractional quantum Hall states. We consider the long-range dipole-dipole interaction and compute the low lying excitations spectrum for the three fractions of the first Jain series $ν= 1/2, 1/4, 1/…

Spins of SMBHs in distant low luminosity AGNs
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
https://arxiv.org/abs/2506.22207 https://

Spins of SMBHs in distant low luminosity AGNs
We estimated radiative efficiency, spin and SMBH mass values for sample of 33 distant low luminosity AGNs. The distribution of the estimated spin values (majority of objects have a spin greater than 0.8) is fairly typical for many types of AGNs. The dependence of the estimated spin values on the estimated SMBH masses shows strong correlation between them, which suggests a rapid increase in spin with mass, i.e. that the main mechanism of mass growth in this case is disk accretion. We did not fin…

Levitated macroscopic rotors with 10 hours of free spin at room temperature
Xianfeng Chen, Nirmala Raj, Ruvi Lecamwasam, Mingxi Chen, Christina Yuan Ling Tan, Syed M. Assad, Ping Koy Lam
https://arxiv.org/abs/2506.03803

Levitated macroscopic rotors with 10 hours of free spin at room temperature
Low-dissipation rotors with large angular momentum are essential for precision sensing and probing macroscopic quantum phenomena. To date, low dissipation can only be achieved for micro-scale rotors. Here, we report a diamagnetically levitated millimeter-scale rotor exhibiting a measured dissipation rate as low as $3.85\,μ\mathrm{Hz}$ at room temperature, corresponding to a free spinning duration exceeding 10 hours. The rotor is levitated stably over an axisymmetric permanent magnet trap, and …

Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
Yi-Ming Wu, Yuxuan Wang, Rafael M. Fernandes
https://arxiv.org/abs/2506.04356 https:…

Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
We investigate the superconducting instabilities induced by altermagnetic fluctuations. Because of the non-trivial sublattice structure of the altermagnetic order, shorter-range and longer-range fluctuations favor qualitatively different types of pairing states. Specifically, while the latter stabilize a standard spin-triplet $p$-wave state, just like ferromagnetic fluctuations, the former leads to intra-unit-cell pairing, in which the Cooper pairs are formed by electrons from different sublatt…

Hole spin qubits in unstrained Germanium layers
Lorenzo Mauro, Mauricio J. Rodriguez, Esteban A. Rodriguez-Mena, Yann-Michel Niquet
https://arxiv.org/abs/2506.04977

Hole spin qubits in unstrained Germanium layers
Strained germanium heterostructures are one of the most promising material for hole spin qubits but suffer from the strong anisotropy of the gyromagnetic factors that hinders the optimization of the magnetic field orientation. The figures of merit (Rabi frequencies, lifetimes...) can indeed vary by an order of magnitude within a few degrees around the heterostructure plane. We propose to address this issue by confining the holes at the interface of an unstrained, bulk Ge substrate or thick buff…

Quantum channel for modeling spin-motion dephasing in Rydberg chains
Christopher Wyenberg, Kent Ueno, Alexandre Cooper
https://arxiv.org/abs/2506.24082 htt…

Quantum channel for modeling spin-motion dephasing in Rydberg chains
We introduce a quantum channel to model the dissipative dynamics resulting from the coupling between spin and motional degrees of freedom in chains of neutral atoms with Rydberg interactions. The quantum channel acts on the reduced spin state obtained under the frozen gas approximation, modulating its elements with time-dependent coefficients. These coefficients can be computed exactly in the perturbative regime, enabling efficient modeling of spin-motion dephasing in systems too large for exac…

This https://arxiv.org/abs/2505.10052 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Test of LGAD as Potential Next-Generation μSR Spectrometer Detectors
Muon Spin Rotation/Relaxation/Resonance ($μ$SR) is a versatile and powerful non-destructive technology for investigating the magnetic properties of materials at the microscopic level. The $μ$SR technique typically utilizes fully spin polarized beams of positive muons generated at particle accelerator facilities and measures the evolution of the muon spin polarization inside a sample to extract information about the local magnetic environment in materials. With the development of accelerator t…

Intersection of two quadrics: modular interpretation and Hitchin morphism
Vladimiro Benedetti, Andreas H\"oring, Jie Liu
https://arxiv.org/abs/2506.04707

Intersection of two quadrics: modular interpretation and Hitchin morphism
The cotangent bundle $T^*X$ of a smooth intersection $X$ of two quadrics admits a Lagrangian fibration determined by the intrinsic geometry of $X$. We show that this fibration is actually the Hitchin morphism if we endow $X$ with a structure of moduli space of twisted Spin-bundles. This generalises the classical result for threefolds, in which case it recovers the Hitchin fibration for the moduli space of rank two bundles with fixed determinant of odd degree on a curve of genus two.

Spin-charge bound states and emerging fermions in a quantum spin liquid
Jens H. Nyhegn, Kristian Knakkergaard Nielsen, Leon Balents, Georg M. Bruun
https://arxiv.org/abs/2507.02508

Spin-charge bound states and emerging fermions in a quantum spin liquid
The complex interplay between charge and spin dynamics lies at the heart of strongly correlated quantum materials, and it is a fundamental topic in basic research with far reaching technological perspectives. We explore in this paper the dynamics of holes in a single band extended $t-J$ model where the background spins form a $\mathbb{Z}_{2}$ quantum spin liquid (QSL). Using a field theory approach based on a parton construction, we show that while the electrons for most momenta fractionalize i…

This https://arxiv.org/abs/2412.12186 has been replaced.
initial toot: https://mastoxiv.page/@…

Emergent electrostatics in planar XY spin models: the bridge connecting topological order with broken $U(1)$ symmetry
Topological phases have been a central focus of condensed-matter physics for over 50 years. Along with many experimental applications, they have provided much intellectual interest due to their characterization via some form of topological ordering, as opposed to the symmetry-breaking ordering of conventional continuous phase transitions. This distinction is most subtle in the case of the Berezinskii-Kosterlitz-Thouless (BKT) transition as its experimental realizations appear to break U(1) symm…

Wave equations for spin 3/2 quantum fields
J. Escamilla-Mu\~noz, S. G\'omez-\'Avila
https://arxiv.org/abs/2506.23057 https://…

Wave equations for spin 3/2 quantum fields
In this work, we review formulations of wave equations for spin-3/2 fields constructed from different Lorentz group representations. We analyze the Joss-Weinberg single-spin chiral representation and the double-spin chiral representation, focusing on the structure of their covariant operators. We explore the Duffin-Kemmer-Petiau (DKP) formalism and its algebraic properties, originally introduced for spin--0 and spin-1 particles, and here considered as a potential framework for spin 3/2. As a re…

This https://arxiv.org/abs/2408.01169 has been replaced.
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Spin parallel transport and holonomy on a spherical two-dimensional electron gas
The quantum conductance of circuits built on flat (Euclidean) two-dimensional electron gases in known to show a symmetric response to the inversion of Rashba spin-orbit coupling fields in Aharonov-Casher interference patterns. Here, we show that this symmetry breaks down in curved (non-Euclidean) circuits defined on a spherical two-dimensional electron gas. We demonstrate that this is a consequence of parallel spin transport and holonomy on the surface of the sphere, and that a symmetric respon…

On a spherically lifted spin model at finite temperature
Xun Tang, Yuehaw Khoo, Lexing Ying
https://arxiv.org/abs/2506.02220 https://…

On a spherically lifted spin model at finite temperature
We investigate an \(n\)-vector model over \(k\) sites with generic pairwise interactions and spherical constraints. The model is a lifting of the Ising model whereby the support of the spin is lifted to a hypersphere. We show that the \(n\)-vector model converges to a limiting distribution at a rate of \(n^{-1/2 + o(1)}\). We show that the limiting distribution for \(n \to \infty\) is determined by the solution of an equality-constrained maximization task over positive definite matrices. We pro…

Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase
Shantanu Pathak, Saswata Bhattacharya
https://arxiv.org/abs/2506.01697

Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase
We report the observation of a persistent spin texture (PST) in pseudo-2D hybrid perovskite, characterized by significant spin splitting strength on the order of \(3 \, \text{eV} \cdot \textÅ\). Using first-principles density functional theory (DFT) calculations, complemented by a \(\mathbf{k} \cdot \mathbf{p}\) model analysis, we validate the presence of PST and its robustness under various conditions. The material's non-centrosymmetric nature and strong spin-orbit coupling ensure uniform spi…

Stable supersolids and boselets in spin-orbit-coupled Bose-Einstein condensates with three-body interactions
Rajamanickam Ravisankar, Sanu Kumar Gangwar, Henrique Fabrelli, Yongping Zhang, Paulsamy Muruganandam, Pankaj Kumar Mishra, Emmanuel Kengne, Gao Xianlong, Boris A. Malomed
https://arxiv.org/abs/2506.03505

Stable supersolids and boselets in spin-orbit-coupled Bose-Einstein condensates with three-body interactions
We explore the stability of supersolid striped waves, plane-wave boselets, and other extended states in one-dimensional spin-orbit-coupled Bose-Einstein condensates with repulsive three-body interactions (R3BIs), modeled by quintic terms in the framework of the corresponding Gross-Pitaevskii equations. In the absence of R3BIs, the extended states are susceptible to the modulational instability (MI) induced by the cubic attractive nonlinearity. Using the linearized Bogoliubov-de-Gennes equations…

Energy dependence of rescattering effect on vector mesons spin alignment at RHIC
Zihan Liu, Ziyang Li, Wangmei Zha, Zebo Tang
https://arxiv.org/abs/2507.00706

Energy dependence of rescattering effect on vector mesons spin alignment at RHIC
Spin alignment of vector mesons in heavy-ion collisions provides a novel probe of quark polarization and hadronization mechanism in quark-gluon plasma. Hadronic rescattering may affect the measured spin alignment of vector mesons due to non-uniform rescattering probability in non-central heavy-ion collisions. Using the UrQMD model, we systematically investigated the hadronic rescattering effect on the measurement of $ρ_{00}$, the spin alignment parameter, for $K^{*0}$, $ϕ$, and $ρ^{0}$ meson…

Coupling Electromagnetism to Torsion: Black Holes and Spin-Charge Interactions
Sebastian Bahamonde, Jorge Maggiolo, Christian Pfeifer
https://arxiv.org/abs/2507.02362

Coupling Electromagnetism to Torsion: Black Holes and Spin-Charge Interactions
The coupling between matter fields and gravity (encoded in the geometry of spacetime) can be realized in various ways. Most commonly, a minimal coupling principle is employed, meaning that all matter fields, except spinors, couple only to the spacetime metric, while spinors additionally couple to the spacetime connection. Non-minimal couplings between matter fields and spacetime curvature can arise, for example, from quantum field theory on curved spacetime through renormalization corrections, …

Spin hydrodynamics -- recent developments
Samapan Bhadury, Zbigniew Drogosz, Wojciech Florkowski, Valeriya Mykhaylova
https://arxiv.org/abs/2507.01864 http…

Spin hydrodynamics -- recent developments
After briefly touching on relativistic hydrodynamics, we provide a detailed description of recent developments in spin hydrodynamics. We discuss the theory of perfect spin hydrodynamics within two different approaches, which lead to identical generalized thermodynamic relations. We also indicate the applicability range of the theory, finding it compatible with the conditions existing in the late stages of heavy-ion collisions. Finally, we discuss the near-equilibrium dynamics.

An entangled photon source for the telecom C-band based on a semiconductor-confined spin
Petros Laccotripes, Junyang Huang, Ginny Shooter, Andrea Barbiero, Matthew S. Winnel, David A. Ritchie, Andrew J. Shields, Tina Muller, R. Mark Stevenson
https://arxiv.org/abs/2507.01648

An entangled photon source for the telecom C-band based on a semiconductor-confined spin
Multiphoton entangled states are a key resource for quantum networks and measurement-based quantum computation. Scalable protocols for generating such states using solid-state spin-photon interfaces have recently emerged, but practical implementations have so far relied on emitters operating at short wavelengths, incompatible with low-loss fibre transmission. Here, we take a key step towards the generation of telecom wavelength multi-qubit entangled states using an InAs/InP quantum dot. After e…

Spinless and spinful charge excitations in moir\'e Fractional Chern Insulators
Miguel Gon\c{c}alves, Juan Felipe Mendez-Valderrama, Jonah Herzog-Arbeitman, Jiabin Yu, Xiaodong Xu, Di Xiao, B. Andrei Bernevig, Nicolas Regnault
https://arxiv.org/abs/2506.05330

Spinless and spinful charge excitations in moiré Fractional Chern Insulators
Fractionally charged elementary excitations, the quasi-electron and quasi-hole, are one of the hallmarks of the fractional Chern insulator (FCI). In this work, we observe that spontaneous spin polarization in twisted MoTe$_2$ leads to multiple species of low-energy quasi-particles distinguished by their spin quantum numbers. We perform large-scale exact diagonalization (ED) calculations to investigate the nature of these excitations and develop a method to extract their fundamental energetic pr…

This https://arxiv.org/abs/2501.00325 has been replaced.
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Deeper insight into the terahertz response of conventional superconductors under magnetic field
We investigate the terahertz conductivity of conventional superconductors in Voigt and Faraday magneto-optical configurations. First, we review theoretical approaches describing the fundamental processes of suppression of superconductivity in magnetic field and how the in-gap states are filled. In the Voigt geometry, thin superconducting films are fully penetrated by the magnetic field which interacts with the spin, thus modifying the magnitudes of the optical gap and of the density of the cond…

This https://arxiv.org/abs/2409.12829 has been replaced.
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Altermagnetic Weyl node-network semimetals protected by spin symmetry
Symmetry protected topology has been studied extensively in the past twenty years, but the topology protected by spin symmetry has just begun to be studied. In this work, based on spin symmetry analysis, we propose that a class of Weyl nodal line semimetals is protected by the spin symmetry. Then, by the first-principles electronic structure calculations, we predict that both altermagnetic $\rm Nb_2FeB_2$ and $\rm Ta_2FeB_2$ are node-network semimetals protected by the spin symmetry. Moreover, …

Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
Xue Han, Jason Qu, Hengxin Tan, Zicheng Tao, Noah M. Meyer, Patrick S. Kirchmann, Yanfeng Guo, Binghai Yan, Zhi-Xun Shen, Jonathan A. Sobota
https://arxiv.org/abs/2506.02466

Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
Despite their importance for exotic quantum effects, the surface electronic structure of magnetic topological insulators MnBi2Te4 and MnBi4Te7 remains poorly understood. Using high-efficiency spin- and angle-resolved photoemission spectroscopy, we directly image the spin-polarization and orbital character of the surface states in both compounds and map our observations onto a model wavefunction to describe the complex spin-orbital texture, which solidifies our understanding of the surface band …

Magnetic Ground State and Spin Excitations in the 2D Trimerized Collinear-II Lattice Antiferromagnet Li2Ni3P4O14
K. S. Chikara, A. K. Bera, A. Kumar, S. M. Yusuf, F. Orlandi, C. Balz
https://arxiv.org/abs/2507.01403

Magnetic Ground State and Spin Excitations in the 2D Trimerized Collinear-II Lattice Antiferromagnet Li2Ni3P4O14
We report the magnetic ground state, spin excitations, and spin Hamiltonian of the 2D spin-1 trimerized Heisenberg antiferromagnet Li2Ni3P4O14. Below the magnetic ordering temperature TN = 14.5 K, the compound exhibits a canted long-range antiferromagnetic order with a propagation vector k = (0 0 0), consistent with the magnetic space group P21/c.1 (No. 14.75). The ground state magnetic structure consists of ferromagnetic spin-trimers of Ni2+ ions. The spin-trimers are coupled antiferromagnetic…

Spin squeezing generation in atom-cavity systems: on the effects of adiabatic elimination beyond the leading order
Stefano Gregorio Giaccari, Giulia Dellea, Marco Giovanni Genoni, Gianluca Bertaina
https://arxiv.org/abs/2506.22383

Spin squeezing generation in atom-cavity systems: on the effects of adiabatic elimination beyond the leading order
Spin-squeezed states are a prototypical example of metrologically useful quantum states where structured entanglement allows for enhanced sensing with respect to the one possible using classically correlated particles. Relevant aspects are both the efficient preparation of spin-squeezed states and the scalability of estimation precision with the number $N$ of probes. Recently, in the context of the generation of spin-squeezed states via coupling of three-level atoms to an optical cavity, it was…

This https://arxiv.org/abs/2501.17753 has been replaced.
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Feasibility study of true muonium observation with the existing Belle-II dataset
True muonium ($μ^+μ^-$) is one of the cleanest bound states, being composed only of leptons, along with true tauonium and positronium. Unlike the latter, true muonium and true tauonium have not been observed so far. This article shows that the spin-0 state of true muonium (para-TM), decaying into two photons, can be observed at a discovery level of significance in the dataset already collected by the Belle-II experiment at the $Υ(4S)$ peak, with certain assumptions on systematic uncertaintie…

Spin Caloritronics in irradiated chiral ferromagnetic systems
Sudin Ganguly, Moumita Dey, Santanu K. Maiti
https://arxiv.org/abs/2507.02765 https://…

Spin Caloritronics in irradiated chiral ferromagnetic systems
We study the charge and spin-dependent thermoelectric response of a ferromagnetic helical system irradiated by arbitrarily polarized light, using a tight-binding framework and the Floquet-Bloch formalism. Transport properties for individual spin channels are determined by employing the non-equilibrium Green's function technique, while phonon thermal conductance is evaluated using a mass-spring model with different lead materials. The findings reveal that that light irradiation induces spin-spli…

Spin-glass state in nickelate superconductors
David R. Saykin, Martin Gonzalez, Jennifer Fowlie, Steven A. Kivelson, Harold Hwang, Aharon Kapitulnik
https://arxiv.org/abs/2506.03262

Spin-glass state in nickelate superconductors
Magneto-optical measurements in La${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ and Nd${}_{0.825}$Sr${}_{0.175}$NiO${}_2$ reveal an intriguing new facet of infinite-layer nickelate superconductors: the onset of spin-glass behavior at a temperature far exceeding the superconducting critical temperature $T_c$. This discovery sharply contrasts with copper oxide superconductors, where magnetism and superconductivity remain largely exclusive. Moreover, the magnitude and onset temperature of the polar Kerr effect …

Transverse diffeomorphism invariant spin-2 theories via gauge invariants
D. Dalmazi, Luiz G. M. Ramos
https://arxiv.org/abs/2506.24047 https://

Transverse diffeomorphism invariant spin-2 theories via gauge invariants
We analyze the particle spectrum of a second-order (in derivatives) theory based on a rank-2 tensor field with both symmetric and antisymmetric components. By demanding the existence of a propagating massless spin-2 particle and invariance under transverse diffeomorphisms, we derive a new class of stable models with two massless scalars and a single massless spin-2 particle. A natural nonlinear completion is proposed in terms of a dynamical metric field. The identification of the spectrum is ca…

Synergistic Effects of Spin-Orbit Coupling and Intercomponent Interactions in Two-Component (2 1)D Photonic Fields
Suri Deekshita, S. Sanjay, S. Saravana Veni, Conrad B. Tabi, Timoleon C. Kofane
https://arxiv.org/abs/2507.02505

Synergistic Effects of Spin-Orbit Coupling and Intercomponent Interactions in Two-Component (2+1)D Photonic Fields
The study investigates the formation, stability and dynamic advancement of two-dimensional vortex quantum droplets within binary Bose-Einstein condensates (BECs), shaped by the interplay of photonic spin-orbit coupling (SOC) and quantum fluctuation effects. SOC leads to significant droplet stretching, resulting in vortex clusters forming in each component. The competition between photonic SOC and Lee-Huang-Yang (LHY) interactions introduces vortices into the condensate, described by the numeric…

This https://arxiv.org/abs/2504.18019 has been replaced.
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A search for $B_{s0}^{*}$ and $B^{*}_{s1}$ through the $K^{-}p$ interaction
The formation and properties of hadrons, particularly those involving heavy quarks, remain a central topic in particle physics due to the nonperturbative nature of Quantum Chromodynamics (QCD) at low energies. Heavy-quark symmetry (HQS) provides a valuable framework for understanding the behavior of heavy quarks in hadronic systems, offering insights into spin and flavor symmetries. However, discrepancies between HQS predictions and experimental observations -- particularly the absence of predi…

Interferometric and Bipartite OTOC for Non-Markovian Open Quantum Spin-Chains and Lipkin-Meshkov-Glick Model
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee
https://arxiv.org/abs/2506.23796

Interferometric and Bipartite OTOC for Non-Markovian Open Quantum Spin-Chains and Lipkin-Meshkov-Glick Model
The information scrambling phenomena in an open quantum system modeled by Ising spin chains coupled to Lipkin-Meshkov-Glick (LMG) baths are observed via an interferometric method for obtaining out-of-time-ordered correlators ($\mathcal{F}-$OTOC). We also use an anisotropic bath connecting to a system of tilted field Ising spin chain in order to confirm that such situations are suitable for the emergence of ballistic spreading of information manifested in the light cones in the $\mathcal{F}-$OTO…

Transition from Optically Excited to Intrinsic Spin Polarization in WSe$_2$
Sebastian Hedwig, Gregor Zinke, J\"urgen Braun, Benito Arnoldi, Aki Pulkkinen, J\'an Min\'ar, Hubert Ebert, Martin Aeschlimann, Benjamin Stadtm\"uller
https://arxiv.org/abs/2506.00161

Transition from Optically Excited to Intrinsic Spin Polarization in WSe$_2$
Layered 2D van der Waals materials, such as transition metal dichalcogenides, are promising for nanoscale spintronic and optoelectronic applications. Harnessing their full potential requires understanding both intrinsic transport and the dynamics of optically excited spin and charge carriers -- particularly the transition between excited spin polarization and the conduction band's intrinsic spin texture. Here, we investigate the spin polarization of the conduction bands of bulk WSe$_2$ using st…

{\guillemotleft}Anticommuting{\guillemotright} $\mathbb{Z}_2$ quantum spin liquids
Sumiran Pujari, Harsh Nigam
https://arxiv.org/abs/2506.03866 https://

«Anticommuting» $\mathbb{Z}_2$ quantum spin liquids
We discuss a class of lattice $S=\frac{1}{2}$ quantum Hamiltonians with bond-dependent Ising couplings with a mutually «anticommuting» algebra of extensively many local $\mathbb{Z}_2$ conserved charges that was introduced in [arXiv:2407.06236] including the nomenclature. This mutual algebra is reminiscent of the spin-$\frac{1}{2}$ Pauli matrix algebra but encoded in the structure of \emph{local conserved charges}. These models have finite residual entropy density in the ground state with a si…

Spin vs. position conjugation in quantum simulations with atoms: application to quantum chemistry
N. A. Moroz (Quantum Technology Centre, M.V. Lomonosov Moscow State University), K. S. Tikhonov (St. Petersburg State University and Russian Quantum Center, Russian Quantum Center), L. V. Gerasimov (Quantum Technology Centre, M.V. Lomonosov Moscow State University, Centre for Interdisciplinary Basic Research, HSE University), A. D. Manukhova (Department of Optics, Palacky University), I. B…

Spin vs. position conjugation in quantum simulations with atoms: application to quantum chemistry
The permutation symmetry is a fundamental attribute of the collective wavefunction of indistinguishable particles. It makes a difference for the behavior of collective systems having different quantum statistics but existing in the same environment. Here we show that for some specific quantum conjugation between the spin and spatial degrees of freedom the indistinguishable particles can behave similarly for either quantum statistics. In particular, a mesoscopically scaled collection of atomic q…

Tunable Itinerant Ferromagnetism in the Two-Dimensional FePd$_2$Te$_2$ Hosting 1D Spin Chains
Alberto M. Ruiz, Andrei Shumilin, Sourav Dey, Diego L\'opez-Alcal\'a, Jos\'e J. Baldov\'i
https://arxiv.org/abs/2506.01009

Tunable Itinerant Ferromagnetism in the Two-Dimensional FePd$_2$Te$_2$ Hosting 1D Spin Chains
One-dimensional (1D) magnetism offers unidirectional spin interactions that allow unique tunable properties and unconventional spin phenomena. However, it often suffers from poor stability, limiting practical applications. In this regard, integrating 1D magnetism into two-dimensional (2D) materials enables a promising route to stabilize these systems while preserving their anisotropic magnetic characteristics. Here, we focus on the 2D ferromagnet FePd$_2$Te$_2$ (T$_C$ = 183K), which hosts 1D sp…

Observation of terahertz spin-Hall magnetoresistance in insulating magnet YIG/Pt
P. Kuba\v{s}\v{c}\'ik, R. Schlitz, O. Gueckstock, O. Franke, M. Borchert, G. Jakob, K. Olejn\'ik, A. Farka\v{s}, Z. Ka\v{s}par, J. Jechumt\'al, M. Bu\v{s}ina, E. Schmoranzerov\'a, P. N\v{e}mec, M. Wolf, Y. Z. Wu, G. Woltersdorf, M. Kl\"aui, P. W. Brouwer, S. T. B. Goennenwein, T. Kampfrath, L. N\'advorn\'ik

Observation of terahertz spin-Hall magnetoresistance in insulating magnet YIG/Pt
We report on the observation of spin Hall magnetoresistance (SMR) in prototypical bilayers of ferrimagnetic yttrium iron garnet (YIG) and platinum in the frequency range from 0 THz to as high as 1.5 THz. The spectral composition of the effect exhibits a strong low-pass behavior, decreasing by approximately 75% from 0 THz to 0.2 THz and vanishing entirely at 1.5 THz. Using a dynamic magnetoresistive model, we can fully explain the spectral dependence by competition of transverse spin-torque (coh…

Fully Generalized Spin Models with Strain Effects of Kitaev Spin Liquid Candidate Materials
Pureum Noh, Hyunggeun Lee, Myung Joon Han, Eun-Gook Moon
https://arxiv.org/abs/2505.23909

Fully Generalized Spin Models with Strain Effects of Kitaev Spin Liquid Candidate Materials
The $KJΓΓ'$ spin model-originally derived for an ideal $P\bar{3}1m$ symmetric geometry-has long served as a central framework for understanding candidate Kitaev materials. In realistic crystals, however, this ideal geometry is seldom realized, either at low temperatures or under external perturbations, limiting the model's quantitative applicability. Here we introduce a fully generalized spin model, denoted $ε$-$KJΓΓ'$, that explicitly incorporates arbitrary lattice deformations $ε$. All …

Generation of Pure Spin Current with Insulating Antiferromagnetic Materials
Yingwei Chen, Junyi Ji, Liangliang Hong, Xiangang Wan, Hongjun Xiang
https://arxiv.org/abs/2507.00369

Generation of Pure Spin Current with Insulating Antiferromagnetic Materials
The generation of pure spin currents is critical for low-dissipation spintronic applications, yet existing methods relying on spin-orbit coupling or ferromagnetic interfaces face challenges in material compatibility and operational robustness. We propose a paradigm-shifting approach to generate symmetry-protected pure spin currents by applying mechanical stress on insulating antiferromagnetic materials, i.e., the pure piezospintronic effect. We first classify magnetic point groups enabling pure…

Impact of the honeycomb spin-lattice on topological magnons and edge states in ferromagnetic 2D skyrmion crystals
Doried Ghader, Bilal Jabakhanji
https://arxiv.org/abs/2506.02192 …

Impact of the honeycomb spin-lattice on topological magnons and edge states in ferromagnetic 2D skyrmion crystals
We theoretically investigate the magnon band topology and associated topological edge states (TESs) in Neel-type ferromagnetic skyrmion crystals (SkXs) stabilized on a two-dimensional honeycomb lattice, using parameters relevant to monolayer CrI3. Employing stochastic Landau-Lifshitz-Gilbert simulations and discrete Holstein-Primakoff bosonization, we analyze the impact of the honeycomb spin-lattice structure on the magnonic spectrum, in contrast to the extensively studied triangular spin-latti…

This https://arxiv.org/abs/2406.12966 has been replaced.
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Origin of the hidden energy scale and the $f$-ratio in geometrically frustrated magnets
Sufficiently clean geometrically frustrated (GF) magnets are the largest class of candidate materials that may host quantum spin liquids (QSLs). Some of them have been shown to exhibit spin-glass freezing, potentially precluding QSLs, at the "hidden energy scale", which is significantly lower than the microscopic energy scale of spin interactions. Here, we investigate the origin of the hidden energy scale and its relationship to the $f$-ratio, the figure of merit for the degree of frustration i…

Probing Quantum Spin Systems with Kolmogorov-Arnold Neural Network Quantum States
Mahmud Ashraf Shamim, Eric Reinhardt, Talal Ahmed Chowdhury, Sergei Gleyzer, Paulo T Araujo
https://arxiv.org/abs/2506.01891

Probing Quantum Spin Systems with Kolmogorov-Arnold Neural Network Quantum States
Neural Quantum States (NQS) are a class of variational wave functions parametrized by neural networks (NNs) to study quantum many-body systems. In this work, we propose SineKAN, the NQS ansatz based on Kolmogorov-Arnold Networks (KANs), to represent quantum mechanical wave functions as nested univariate functions. We show that \sk wavefunction with learnable sinusoidal activation functions can capture the ground state energies, fidelities and various correlation functions of the 1D Transverse-F…

This https://arxiv.org/abs/2412.17457 has been replaced.
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Optical Properties and Spin States of Inter-layer Carbon Defect Pairs in Hexagonal Boron Nitride: A First-Principles Study
Substitutional carbon defects in hexagonal boron nitride (hBN) are prominent single photon emitters (SPEs), and their potential for spin activity ($S\geq1$) is particularly intriguing. While studies have largely focused on intra-layer defects, we employ density functional theory (DFT) to investigate inter-layer dimers of identical carbon species (C$_X$C$_X$). We demonstrate that these C$_X$C$_X$ pairs can exhibit a stable triplet spin state at room temperature when closely spaced (e.g., within …

Rashba-induced spin Hall response in a disordered $WTe_2$ four-terminal structure
Swastik Sahoo, Satadeep Bhattacharjee, Bhaskaran Muralidharan
https://arxiv.org/abs/2507.01584

Rashba-induced spin Hall response in a disordered $WTe_2$ four-terminal structure
The paramount acumen for controlling spin transport properties in nonmagnetic materials is the usage of spin-orbit coupling (SOC). We propose a model to calculate the spin hall angle (SHA) for the elemental transition metal dichalcogenide compound, $WTe_2$ entrenched on the intrinsic Rashba SOC. This model, is based on the Landauer-Buttiker formalism for quantum transport, and the $4$-terminal device setup with the presence of disorder from random onsite potential fluctuations. The SHA, includi…

This https://arxiv.org/abs/2505.22420 has been replaced.
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Robustness of topological edge states in open alternating spin chains
Both the Haldane spin-$1$ chain and dimerized chains of spin-$1/2$ exhibit topologically protected edge states that are robust against specific perturbations. Recently, such spin chains have been specifically assembled on surfaces and we investigate here the robustness of these edge states against coupling to the surface. Since no physical system can be considered perfectly isolated, it is crucial to examine whether topological robustness is maintained in the presence of environme…

This https://arxiv.org/abs/2505.09579 has been replaced.
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Three regimes of a picosecond magnetoacoustics in ferromagnetic structures
The development of magnonics requires energy-efficient methods for generating spin waves and controlling their parameters. Acoustic waves are known to resonantly excite spin waves through magneto-elastic wave formation or to induce non-resonant forced magnetization oscillations. Short acoustic wavepackets enable another unexplored resonant interaction regime -- the Cherenkov radiation of spin waves. This raises a question regarding the criteria and signatures of these three regimes of picosecon…

Spin-disorder-induced angular anisotropy in polarized magnetic neutron scattering
I. Titov, M. Bersweiler, M. P. Adams, E. P. Sinaga, V. Rai, S. Liscak, M. Lahr, T. L. Schmidt, V. M. Kuchkin, A. Haller, K. Suzuki, N. -J. Steinke, D. Alba Venero, D. Honecker, J. Kohlbrecher, L. F. Barquin, A. Michels
https://arxiv.org/abs/2507.01…

Spin-disorder-induced angular anisotropy in polarized magnetic neutron scattering
We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material. Based on an analytical prediction using micromagnetic theory, the difference between the spin-up and spin-down SANS cross sections is expected to show a spin-disorder-induced anisotropy. The effect is particularly pronounced in inhomogeneous magnetic materials, such as nanoporous ferromagnets, magnetic nanocomposite…

Identification of gapless phases by squaring a twist operator
Hang Su, Yuan Yao, Akira Furusaki
https://arxiv.org/abs/2506.02496 https://

Identification of gapless phases by squaring a twist operator
We propose a general necessary condition for a spin chain with SO(3) spin-rotation symmetry to be gapped. Specifically, we prove that the ground state(s) of an SO(3)-symmetric gapped spin chain must be spin singlet(s), and the expectation value of the square of a twist operator asymptotically approaches unity in the thermodynamic limit, where finite-size corrections are inversely proportional to the square root of the system size. This theorem provides (i) supporting evidence for various conjec…

Beyond Diamond: Interpretable Machine Learning Discovery of Coherent Quantum Defect Hosts in Semiconductors
Mohammed Mahshook, Rudra Banerjee
https://arxiv.org/abs/2506.03844

Beyond Diamond: Interpretable Machine Learning Discovery of Coherent Quantum Defect Hosts in Semiconductors
Quantum point defects in wide bandgap semiconductors-such as the nitrogen-vacancy (NV) center in diamond are leading candidates for solid-state spin qubits due to their long coherence times and optically addressable spin states. Yet, identifying host materials capable of supporting such deep-level defects remains a significant challenge, owing to the complex interplay between chemical composition, crystal structure, and electronic environment. Here, we present a scalable, interpretable machine …

Helical spin dynamics in Cu$_2$OSeO$_3$ as measured with small-angle neutron scattering
Victor Ukleev, Priya R. Baral, Robert Cubitt, Nina-Juliane Steinke, Arnaud Magrez, Oleg I. Utesov
https://arxiv.org/abs/2507.01164

Helical spin dynamics in Cu$_2$OSeO$_3$ as measured with small-angle neutron scattering
The insulating chiral magnet Cu$_2$OSeO$_3$ exhibits a rich array of low-temperature magnetic phenomena, making it a prime candidate for the study of its spin dynamics. Using spin wave small-angle neutron scattering (SWSANS), we systematically investigated the temperature-dependent behavior of the helimagnon excitations in the field-polarized phase of Cu$_2$OSeO$_3$. Our measurements, spanning 5-55 K, reveal the temperature evolution of spin-wave stiffness and damping constant with unprecedente…

This https://arxiv.org/abs/2410.02908 has been replaced.
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Magnon spectroscopy in the electron microscope
The miniaturisation of transistors is approaching its limits due to challenges in heat management and information transfer speed. To overcome these obstacles, emerging technologies such as spintronics are being developed, which leverage the electron's spin in addition to its charge. Local phenomena at interfaces or structural defects will greatly influence the efficiency of spin-based devices, making the ability to study and control spin wave propagation at the nano- and atomic scales a key cha…

Spin-orbit interaction in square core-shell nanowires
Anna Sitek, Tudor Gabriel Dumitru, Sigurdur I. Erlingsson, Andrei Manolescu
https://arxiv.org/abs/2506.02769

Spin-orbit interaction in square core-shell nanowires
We theoretically investigate the spin-orbit interaction of electrons confined in the outer regions of square core-shell nanowires. The polygonal cross section leads to the accumulation of low-energy electrons in the corners and the formation of a significant energy gap that separates these corner-localized states from higher-energy states localized along the sides. We show that the low-energy states behave like the states of independent quantum wires, while the higher-energy states exhibit feat…

Phenomenology of altermagnets
Maxim Mostovoy
https://arxiv.org/abs/2506.01823 https://arxiv.org/pdf/2506.01823

Phenomenology of altermagnets
Altermagnets have recently emerged as a new class of magnetic materials sharing properties of both antiferromagnets and ferromagnets. Despite very small net magnetization, they show phenomena usually associated with ferromagnetism, such as the Faraday, Kerr and Anomalous Hall effects, resulting from the relativistic spin-orbit coupling, as well as the spin splitting of electron bands and Spin Hall Effect of non-relativistic origin. Spin space groups and magnetic multipoles are used to explain s…

Spin Seebeck Effect of Triangular-lattice Spin Supersolid
Yuan Gao, Yixuan Huang, Sadamichi Maekawa, Wei Li
https://arxiv.org/abs/2506.22414 https://

Spin Seebeck Effect of Triangular-lattice Spin Supersolid
Using our developed thermal tensor-network approach, we investigate the spin Seebeck effect (SSE) of the triangular-lattice quantum antiferromagnet hosting spin supersolid phase. We focus on the low-temperature scaling of normalized spin current $\tilde{I}_S$ through the interface, and benchmark our approach on 1D Heisenberg chain, with the negative spinon spin current reproduced. In addition, we find an algebraic scaling $\tilde{I}_S \sim T^α$ with varying exponent $α$ in the Tomonaga-Luttin…

Spin-dependent transport through edge states in 2D semi-Dirac materials with Rashba spin-orbit coupling and band inversion
Marta Garc\'ia-Olmos, Yuriko Baba, Alexander L\'opez, Mario Amado, Rafael A. Molina
https://arxiv.org/abs/2505.24745

Spin-dependent transport through edge states in 2D semi-Dirac materials with Rashba spin-orbit coupling and band inversion
We investigate the bulk-boundary correspondence in two-dimensional type-I semi-Dirac materials with band inversion and Rashba spin-orbit coupling. Employing a dimensional reduction framework, we identify the Zak phase along the quadratically dispersing direction as a topological invariant that captures the presence of edge states. In the non-trivial topological regime, systems with finite width exhibit energy-dependent edge states that are topologically protected only at specific momenta. At kx…

Weak localization as probe of spin-orbit-induced spin-split bands in bilayer graphene proximity coupled to WSe$_2$
E. Icking, F. W\"ortche, A. W. Cummings, A. W\"ortche, K. Watanabe, T. Taniguchi, C. Volk, B. Beschoten, C. Stampfer
https://arxiv.org/abs/2505.24632

Weak localization as probe of spin-orbit-induced spin-split bands in bilayer graphene proximity coupled to WSe$_2$
Proximity coupling of bilayer graphene (BLG) to transition metal dichalcogenides (TMDs) offers a promising route to engineer gate-tunable spin-orbit coupling (SOC) while preserving BLG's exceptional electronic properties. This tunability arises from the layer-asymmetric electronic structure of gapped BLG, where SOC acts predominantly on the layer in contact with the TMD. Here, we present high-quality BLG/WSe$_2$ devices with a proximity-induced SOC gap and excellent electrostatic control. Opera…

Exactly solvable spin liquids in Kitaev bilayers and moir\'e superlattices
Ivan Dutta, Anamitra Mukherjee, Onur Erten, Kush Saha
https://arxiv.org/abs/2506.04181

Exactly solvable spin liquids in Kitaev bilayers and moiré superlattices
Building on the recent advancements on moiré superlattices, we propose an exactly solvable model with Kitaev-type interactions on a bilayer honeycomb lattice for both AA stacking and moiré superlattices. Employing Monte Carlo simulations and variational analysis, we uncover a rich variety of phases where the intra and interlayer $\mathbb{Z}_2$ fluxes (visons) are arranged in a periodic fashion in the ground state, tuned by interlayer coupling and out-of-plane external magnetic field. We furth…

Proximity-Induced Rashba Spin-Orbit Interaction in BaMnO$_\text{3}|$KTaO$_\text{3}$ Heterostructure for Antiferromagnetic Spintronics
Vivek Kumar, Nirmal Ganguli
https://arxiv.org/abs/2506.01861

Proximity-Induced Rashba Spin-Orbit Interaction in BaMnO$_\text{3}|$KTaO$_\text{3}$ Heterostructure for Antiferromagnetic Spintronics
We investigate the emergence of Rashba-like spin-orbit interaction in the antiferromagnetic BaMnO$_3|$KTaO$_3$ oxide heterostructure using density functional theory (DFT). The analysis of our charge transfer model based on electrostatic potential reveals a type-I band alignment and establishes the conditions under which the interface becomes conducting. Our calculations uncover pronounced linear Rashba splitting ($α_{(1)}$ = 0.114~eVÅ) in Mn 3$d$ bands near the Fermi level, induced by pr…

Coercivity-size map of magnetic nanoflowers: spin disorder tunes the vortex reversal mechanism and tailors the hyperthermia sweet spot
Elizabeth M Jefremovas, Lisa Calus, Jonathan Leliaert
https://arxiv.org/abs/2507.02154

Coercivity-size map of magnetic nanoflowers: spin disorder tunes the vortex reversal mechanism and tailors the hyperthermia sweet spot
Iron-oxide nanoflowers (NFs) are one of the most efficient nanoheaters for magnetic hyperthermia therapy (MHT). However, the physics underlying the spin texture of disordered iron-oxide nanoparticles beyond the single-domain limit remains still poorly understood. Using large-scale micromagnetic simulations we completely map the magnetization of NFs over an unprecedented size range, from 10 to 400 nm in diameter, connecting their microstructure to their macroscopic magnetic response. Above the s…

Classical spin liquids from frustrated Ising models in hyperbolic space
Fabian K\"ohler, Johanna Erdmenger, Roderich Moessner, Matthias Vojta
https://arxiv.org/abs/2506.02113

Classical spin liquids from frustrated Ising models in hyperbolic space
Antiferromagnetic Ising models on frustrated lattices can realize classical spin liquids, with highly degenerate ground states and, possibly, fractionalized excitations and emergent gauge fields. Motivated by the recent interest in many-body system in negatively curved space, we study hyperbolic frustrated Ising models. Specifically, we consider nearest-neighbor Ising models on tesselations with odd-length loops in two-dimensional hyperbolic space. For finite systems with open boundaries we det…

This https://arxiv.org/abs/2505.10907 has been replaced.
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Effect of crystallinity on spin-orbit torque in 5$\textit{d}$ iridium oxide IrO$_{2}$
The 5$\textit{d}$ transition-metal oxides provide an intriguing platform for generating an efficient spin current due to a unique electronic structure dominated by 5d electrons with strong spin-orbit coupling. Here, we report on the effect of crystallinity on current-driven spin-orbit torque (SOT) in binary 5$\textit{d}$ iridium oxide IrO$_{2}$ thin films by controlling amorphous, polycrystalline, and epitaxial states. By conducting harmonic Hall measurement in bilayers composed of ferromagneti…

Buried unstrained Ge channels: a lattice-matched platform for quantum technology
Davide Costa, Karina Hudson, Patrick Del Vecchio, Lucas E. A. Stehouwer, Alberto Tosato, Davide Degli Esposti, Mario Lodari, Stefano Bosco, Giordano Scappucci
https://arxiv.org/abs/2506.04724

Buried unstrained Ge channels: a lattice-matched platform for quantum technology
Ge and Si strained quantum wells have enabled the most advanced spin-qubit quantum processors, but they are deposited on defective, metamorphic SiGe substrates, which may impact device performance and scaling. Here we introduce an alternative platform, based on a heterojunction between unstrained Ge and a strained SiGe barrier, which is lattice-matched to a Ge substrate. In a structure with a 52-nm-thick strained SiGe barrier, we demonstrate a low-disorder two-dimensional hole gas with a high-m…

Interplay of frustration and quantum fluctuations in a spin-1/2 anisotropic square lattice
L. M. Ramos, F. M. Zimmer, M. Schmidt
https://arxiv.org/abs/2507.02623

Interplay of frustration and quantum fluctuations in a spin-1/2 anisotropic square lattice
Motivated by theoretical and experimental studies reported by Yamaguchi et al. (Phys. Rev. B 98, 094402 (2018)), we performed a cluster mean-field analysis of an anisotropic Heisenberg model with six competing exchange interactions. We study the ground and thermal states by tuning the spin anisotropy, magnetic field, and temperature. Our results show that an external magnetic field induces quantum fluctuations, suppressing local moments and leading to the occurrence of a magnetization plateauli…

Topological phase control in Mn1-xGexBi2Te4 via spin-orbit coupling and magnetic configuration engineering
A. M. Shikin, N. L. Zaitsev, A. V. Eryzhenkov, R. V. Makeev, T. P. Estyunina, D. A. Estyunin, A. V. Tarasov
https://arxiv.org/abs/2506.00511

Topological phase control in Mn1-xGexBi2Te4 via spin-orbit coupling and magnetic configuration engineering
Magnetic topological systems based on MnBi2Te4 have recently attracted significant attention due to their rich interplay between magnetism and topological electronic states. In this work, using density functional theory (DFT), we investigate topological phase transitions (TPTs) in Mn1-xGexBi2Te4 compounds with both ferromagnetic (FM) and antiferromagnetic (AFM) ordering under variations of spin-orbit coupling (SOC) strength and uniaxial strain along the c axis. We show that the emergence of a W…

This https://arxiv.org/abs/2502.15449 has been replaced.
initial toot: https://mastoxiv.page/@a…

Sign Changes in Heat, Spin, and Orbital Magnon Transport Coefficients in Kitaev Ferromagnets
Both Kitaev and Dzyaloshinskii-Moriya interactions (DMI) are known to promote intrinsic contributions to the magnon Hall effects such as the thermal Hall and the spin Nernst effects in collinear magnets. Previously, it was reported that a sign change in those transversal transport coefficients only appears in the presence of Kitaev interaction, but not for DMI, which qualitatively distinguishes both kinds of spin-anisotropic interactions in ferromagnets. Herein, we systematically study how the …

This https://arxiv.org/abs/2412.15168 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Dynamic structure factor of a spin-1/2 Heisenberg chain with long-range interactions
We study the dynamic structure factor $S(k,ω)$ of the spin-1/2 chain with long-range, power-law decaying unfrustrated (sign alternating) Heisenberg interactions $J_r \sim (-1)^{r-1} r^{-α}$ by means of stochastic analytic continuation (SAC) of imaginary-time correlations computed by quantum Monte Carlo calculations. We do so in both the long-range antiferromagnetic (AFM, for $α\lesssim 2.23$) and quasi-long-range-ordered (QLRO, for $α\gtrsim 2.23$) ground-state phases, employing diffe…

Magnetic interactions as a pivotal determinant in stabilizing a novel AgIIAgIIIF5 polymorph with high spin AgIII
Daniel Jezierski, Wojciech Grochala
https://arxiv.org/abs/2506.00538

Magnetic interactions as a pivotal determinant in stabilizing a novel AgIIAgIIIF5 polymorph with high spin AgIII
Based on theoretical calculations, we introduce a new AgIIAgIIIF5 monoclinic polymorph with a rare high spin AgIII. Our analysis of the experimental xray diffraction data available in the literature reveals that this polymorph was likely prepared in the past in a mixture with the triclinic form of the same compound. Theoretical calculations reproduce very well the lattice parameters of both forms. Calculations suggest that under ambient conditions, the monoclinic form is the more energetically …

This https://arxiv.org/abs/2412.18220 has been replaced.
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Spin-Splitting Magnetoresistance in Altermagnetic RuO2 Thin Films
The recently discovered altermagnets, featured by the exotic correlation of magnetic exchange interaction and alternating crystal environments, have offered exciting cutting-edge opportunities for spintronics. Nevertheless, the altermagnetism of RuO2, one of the earliest-discovered altermagnets, is currently under intense debate. Here we try to resolve this controversy by demonstrating an altermagnetic spin-splitting magnetoresistance (SSMR) effect that is driven by a spin current associated wi…

Ising spin-1/2 XXZ chain's quantum problems beyond the spinon paradigm
J. M. P. Carmelo, P. D. Sacramento
https://arxiv.org/abs/2506.22948 https://

Ising spin-1/2 XXZ chain's quantum problems beyond the spinon paradigm
Spin chains are correlated quantum models of great interest in quantum systems and materials exhibiting quasi-one-dimensional magnetic properties. Here we review results on quantum problems associated with spin chains that are beyond the usual spinon paradigm. In this review we consider two quantum problems that are beyond the spinon representation: (a) Spin Bethe strings of length n that have no spinon representation, contribute to the dynamical properties of the spin-1/2 XXZ chain with anisot…

Altermagnetic polarons
Maria Daghofer, Krzysztof Wohlfeld, Jeroen van den Brink
https://arxiv.org/abs/2506.03261 https://arxiv.org/pd…

Altermagnetic polarons
While a spin-dependent band splitting is one of the characteristic features of altermagnets, the conventional band picture itself breaks down in the many altermagnets that are correlated Mott materials. We employ two numerical many-body methods, the self-consistent Born approximation and variational cluster approach, to explore this strongly correlated regime and investigate hole motion in Mott altermagnets. Our results reveal that spin-dependent spectral-weight transfer is the dominant signatu…

This https://arxiv.org/abs/2410.22773 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Exact volume-law entangled zero-energy eigenstates in a large class of spin models
Exact solutions for excited states in non-integrable quantum Hamiltonians have revealed novel dynamical phenomena that can occur in quantum many-body systems. This work proposes a method to analytically construct a specific set of volume-law-entangled zero-energy exact excited eigenstates in a large class of spin Hamiltonians. In particular, we show that all spin chains that satisfy a simple set of conditions host exact volume-law zero-energy eigenstates in the middle of their spectra. Examples…

Plasmonic detection of Rashba spin-orbit coupling in monolayer transition-metal dichalcogenides
Y. Li, Z. H. Tao, Y. M. Xiao, W. Xu, Q. N. Li, F. M. Peeters, D. Neilson, M. V. Milosevic
https://arxiv.org/abs/2507.00567

Plasmonic detection of Rashba spin-orbit coupling in monolayer transition-metal dichalcogenides
Rashba spin-orbit coupling (RSOC) induces strong momentum-dependent spin splitting and plays a crucial role in fields like spintronics and topological photonics. We here theoretically investigate the collective excitations in monolayer transition metal dichalcogenides (ML-TMDs) hosting RSOC, and conceive an approach to precisely quantify the strength of RSOC using plasmons. We determine the electron energy loss function (EELF) and plasmon dispersions for n-type ML-TMD from the dynamic dielectri…