Tootfinder

Scheduling for On-Board Federated Learning with Satellite Clusters
Nasrin Razmi, Bho Matthiesen, Armin Dekorsy, Petar Popovski
https://arxiv.org/abs/2402.09105

Scheduling for On-Board Federated Learning with Satellite Clusters
Mega-constellations of small satellites have evolved into a source of massive amount of valuable data. To manage this data efficiently, on-board federated learning (FL) enables satellites to train a machine learning (ML) model collaboratively without having to share the raw data. This paper introduces a scheme for scheduling on-board FL for constellations connected with intra-orbit inter-satellite links. The proposed scheme utilizes the predictable visibility pattern between satellites and grou…

Topological insulators based on $p$-wave altermagnets, electrical control and detection of the altermagnetic domain wall
Motohiko Ezawa
https://arxiv.org/abs/2404.08300

Topological insulators based on $p$-wave altermagnets, electrical control and detection of the altermagnetic domain wall
We study a one-dimensional hybrid system made of a $p$-wave altermagnet and a metal possessing the orbital degree of freedom. The hybrid system is a topological insulator without the spin-orbit interaction. There emerge two edge states per one edge, because the system is mapped to a set of two copies of a topological insulator. Each copy resembles the long-range Su-Schrieffer-Heeger model but it is topologically different. Topological interface states emerge at a domain wall of the $p$-wave alt…

Numerical model of Phobos' motion incorporating the effects of free rotation
Yongzhang Yang, Jianguo Yan, Nianchuan Jian, Koji Matsumoto, Jean-Pierre Barriot
https://arxiv.org/abs/2405.05519

Numerical model of Phobos' motion incorporating the effects of free rotation
High-precision ephemerides are not only useful in supporting space missions, but also in investigating the physical nature of celestial bodies. This paper reports an update to the orbit and rotation model of the Martian moon Phobos. In contrast to earlier numerical models, this paper details a dynamical model that fully considers the rotation of Phobos. Here, Phobos' rotation is first described by Euler's rotational equations and integrated simultaneously with the orbital motion equations. We d…

This https://arxiv.org/abs/2310.03769 has been replaced.
link: https://scholar.google.com/scholar?q=a

What to expect from scalar-tensor space geodesy
Scalar-tensor theories with screening mechanisms come with non-linearities that make it difficult to study setups of complex geometry without resorting to numerical simulations. In this article, we use the $\textit{femtoscope}$ code that we introduced in a previous work in order to compute the fifth force arising in the chameleon model in the Earth orbit. We go beyond published works by introducing a departure from spherical symmetry $\unicode{x2014}$ embodied by a mountain on an otherwise sphe…

Quantum Spin Liquids in Weak Mott Insulators with a Spin-Orbit Coupling
Asimpunya Mitra, Daniel J. Schultz, Yong Baek Kim
https://arxiv.org/abs/2404.05806 …

Quantum Spin Liquids in Weak Mott Insulators with a Spin-Orbit Coupling
The weak Mott insulating regime of the triangular lattice Hubbard model exhibits a rich magnetic phase diagram as a result of the ring exchange interaction in the spin Hamiltonian. These phases include the Kalmeyer-Laughlin type chiral spin liquid (CSL) and a valence bond solid (VBS). A natural question arises regarding the robustness of these phases in the presence of a weak spin-orbit coupling (SOC). In this study, we derive the effective spin model for the spin-orbit coupled triangular latti…

Expected Impact of Glints from Space Debris in the LSST
J. Anthony Tyson, Adam Snyder, Daniel Polin, Meredith L. Rawls, Zeljko Ivezic
https://arxiv.org/abs/2403.04942

Expected Impact of Glints from Space Debris in the LSST
We examine the simple model put forth in a recent note by Loeb 2024 regarding the brightness of space debris in the size range of 1-10 cm and their impact on the Rubin Observatory LSST transient object searches. Their main conclusion was that "image contamination by untracked space debris might pose a bigger challenge [than large commercial satellite constellations in LEO]". Following corrections and improvements to this model, we calculate the apparent brightness of tumbling Low Earth Orbit (L…

This https://arxiv.org/abs/2402.19039 has been replaced.
initial toot: https://mastoxiv.page/@a…

Triplet fermions in MXenes: The Applications for spintronic-based devices
We investigate the electronic properties of MXenes by three bands tight-binding model of \d_{z^2} , \d_{xy} , and \d_{x^2-y^2} orbitals. The three corresponding bands touch each other at high symmetry K point in the case of absence of spin-orbit interaction. The proper parameters can be obtained by Slater-Koster parameters related to chemical bonding, π, σ, and δbonds. The model calculated for these band structures make an agreement with the same trend as discussed in DFT calculation which t…

Evolution of the nuclear spin-orbit splitting explored via the $^{32}$Si($d$,$p$)$^{33}$Si reaction using SOLARIS
J. Chen, B. P. Kay, C. R. Hoffman, T. L. Tang, I. A. Tolstukhin, D. Bazin, R. S. Lubna, Y. Ayyad, S. Beceiro-Novo, B. J. Coombes, S. J. Freeman, L. P. Gaffney, R. Garg, H. Jayatissa, A. N. Kuchera, P. MacGregor, A. J. Mitchell, W. Mittig, B. Monteagudo, A. Munoz-Ramos, C. M\"uller-Gatermann, F. Recchia, N. Rijal, C. Santamaria, M. Z. Serikow, D. K. Sharp, J. Smith, J. …

Evolution of the nuclear spin-orbit splitting explored via the $^{32}$Si($d$,$p$)$^{33}$Si reaction using SOLARIS
The spin-orbit splitting between neutron 1$p$ orbitals at $^{33}$Si has been deduced using the single-neutron-adding ($d$,$p$) reaction in inverse kinematics with a beam of $^{32}$Si, a long-lived radioisotope. Reaction products were analyzed by the newly implemented SOLARIS spectrometer at the reaccelerated-beam facility at the National Superconducting Cyclotron Laboratory. The measurements show reasonable agreement with shell-model calculations that incorporate modern cross-shell interactions…

Structure of Periodic Orbit Families in the Hill Restricted 4-Body Problem
Gavin M. Brown, Luke T. Peterson, Damennick B. Henry, Daniel J. Scheeres
https://arxiv.org/abs/2402.19181

Structure of Periodic Orbit Families in the Hill Restricted 4-Body Problem
The Hill Restricted 4-Body Problem (HR4BP) is a coherent time-periodic model that can be used to represent motion in the Sun-Earth-Moon (SEM) system. Periodic orbits were computed in this model to better understand the periodic orbit family structures that exist in these types of systems. First, periodic orbits in the Circular Restricted 3-Body Problem (CR3BP) representation of the Earth-Moon (EM) system were identified. A Melnikov-type function was used to identify a set of candidate points on…

Superconductivity in Two-Dimentional Systems with Unconventional Rashba Bands
Ran Wang, Jiayang Li, Xinliang Huang, Rui Song, Ning Hao
https://arxiv.org/abs/2403.05051

Superconductivity in Two-Dimentional Systems with Unconventional Rashba Bands
In two-dimensional system with Rashba spin-orbit coupling, it is well-known that superconductivity can have mixed spin-singlet and -triplet parity, and the $\boldsymbol{d}$-vector of spin-tripet pairing is parallel to $\boldsymbol{g}$-vector of Rashba spin-orbit coupling. Here, we propose a model to describe a two-dimensional system with unconventional Rashba bands and study its superconductivity. We show that the $\boldsymbol{d}$-vector of spin-tripet pairing can be either parallel or perpendi…

Direct Imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star, HIP 39017
Taylor L. Tobin, Thayne Currie, Yiting Li, Jeffrey Chilcote, Timothy D. Brandt, Brianna Lacy, Masayuki Kuzuhara, Maria Vincent, Mona El Morsy, Vincent Deo, Jonathan P. Williams, Olivier Guyon, Julien Lozi, Sebastien Vievard, Nour Skaf, Kyohoon Ahn, Tyler Groff, N. Jeremy Kasdin, Taichi Uyama, Motohide Tamura

Direct Imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star, HIP 39017
We present the direct imaging discovery of a substellar companion (a massive planet or low-mass brown dwarf) to the young, $γ$ Doradus-type variable star, HIP 39017 (HD 65526). The companion's SCExAO/CHARIS JHK ($1.1-2.4μ$m) spectrum and Keck/NIRC2 L$^{\prime}$ photometry indicate that it is an L/T transition object. A comparison of the JHK+L$^{\prime}$ spectrum to several atmospheric model grids finds a significantly better fit to cloudy models than cloudless models. Orbit modeling with rela…

BRDF-Based Photometric Modeling of LEO Constellation Satellite from Massive Observations
Yao Lu
https://arxiv.org/abs/2403.05831 https://

BRDF-Based Photometric Modeling of LEO Constellation Satellite from Massive Observations
Modeling the brightness of satellites in large Low-Earth Orbit (LEO) constellations can not only assist the astronomical community in assessing the impact of reflected light from satellites, optimizing observing schedules and guiding data processing, but also motivate satellite operators to improve their satellite designs, thus facilitating cooperation and consensus among different stakeholders. This work presents a photometric model of the Starlink satellites based on the Bidirectional Reflect…

Satellite Federated Edge Learning: Architecture Design and Convergence Analysis
Yuanming Shi, Li Zeng, Jingyang Zhu, Yong Zhou, Chunxiao Jiang, Khaled B. Letaief
https://arxiv.org/abs/2404.01875

Satellite Federated Edge Learning: Architecture Design and Convergence Analysis
The proliferation of low-earth-orbit (LEO) satellite networks leads to the generation of vast volumes of remote sensing data which is traditionally transferred to the ground server for centralized processing, raising privacy and bandwidth concerns. Federated edge learning (FEEL), as a distributed machine learning approach, has the potential to address these challenges by sharing only model parameters instead of raw data. Although promising, the dynamics of LEO networks, characterized by the hig…

This https://arxiv.org/abs/2304.08199 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Spin-orbit coupled Hubbard skyrmions
When the material phases exhibit topological quantum numbers, they host defects protected by the nontrivial topology. Magnetic skyrmions are such ``quantized" objects and although many of them are metals they had been most likely treated in theories as purely classical spin states. Here, we show that the electrons described by the Hubbard model with strong spin-orbit couplings can exhibit various nano- or flake-size skyrmions in their ground state. Importantly, the conducting electrons forming …

Light-element and purely charge-based topological materials
Nassim Derriche, Marcel Franz, George Sawatzky
https://arxiv.org/abs/2404.03832 https://…

Light-element and purely charge-based topological materials
We examine a class of Hamiltonians characterized by interatomic, interorbital even-odd parity hybridization as a model for a family of topological insulators without the need for spin-orbit coupling. Non-trivial properties of these materials are exemplified by studying the topologically-protected edge states of s-p hybridized alkali and alkaline earth atoms in one and two-dimensional lattices. In 1D the topological features are analogous to the canonical Su-Schrieffer-Heeger model but, remarkab…

Corridor MPC for Multi-Agent Inspection of Orbiting Structures
Gregorio Marchesini, Pedro Roque, Dimos V. Dimarogonas
https://arxiv.org/abs/2402.17596 http…

Corridor MPC for Multi-Agent Inspection of Orbiting Structures
In this work, we propose an extension of the previously introduced Corridor Model Predictive Control scheme for high-order and distributed systems, with an application for on-orbit inspection. To this end, we leverage high order control barrier function (HOCBF) constraints as a suitable control approach to maintain each agent in the formation within a safe corridor from its reference trajectory. The recursive feasibility of the designed MPC scheme is tested numerically, while suitable modificat…

Predissociation dynamics of the hydroxyl radical (OH) based on a five-state spectroscopic model
Georgi B. Mitev, Jonathan Tennyson, Sergey N. Yurchenko
https://arxiv.org/abs/2403.19796

Predissociation dynamics of the hydroxyl radical (OH) based on a five-state spectroscopic model
Multi-reference configuration interaction (MRCI) potential energy curves (PECs) and spin-orbit couplings for the X $^2Π$, A $^2 Σ^+$, 1 $^2 Σ^-$, 1 $^4 Σ^-$, and 1 $^4 Π$ states of OH are computed and refined against empirical energy levels and transitions to produce a spectroscopic model. Predissociation lifetimes are determined by discretising continuum states in the variational method nuclear motion calculation by restricting the calculation to finite range of internuclear separations. …

A general polarimetric model for transiting and non-transiting ringed exoplanets
Allard K. Veenstra, Jorge I. Zuluaga, Jaime A. Alvarado-Montes, Mario Sucerquia, Daphne M. Stam
https://arxiv.org/abs/2404.16606

A general polarimetric model for transiting and non-transiting ringed exoplanets
We explore the potential of polarimetry as a tool for detecting and characterizing exorings. For that purpose, we have improved the publicly available photometric code Pryngles by adding the results of radiative transfer calculations that fully include polarization and scattering by irregularly shaped particles. With this improved code, we compute the total and polarized fluxes and the degree of polarization of a ringed gas giant along its orbit. We vary key model parameters such as the orbit i…

This https://arxiv.org/abs/2309.12989 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A determination of the LMC dark matter subhalo mass using the MW halo stars in its gravitational wake
Our goal is to study the gravitational effects caused by the passage of the Large Magellanic Cloud (LMC) in its orbit on the stellar halo of the Milky Way (MW). We employed the Gaia Data Release 3 to construct a halo tracers data set consisting of K-Giant stars and RR-Lyrae variables. Additionally, we have compared the data with a theoretical model to estimate the DM subhalo mass. We have improved the characterisation of the local wake and the collective response due to the LMC orbit. On the ot…

Chern number landscape of spin-orbit coupled chiral superconductors
Matthew Bunney, Jacob Beyer, Ronny Thomale, Carsten Honerkamp, Stephan Rachel
https://arxiv.org/abs/2405.03757 …

Chern number landscape of spin-orbit coupled chiral superconductors
Chiral superconductors are one of the predominant quantum electronic states of matter where topology, symmetry, and Fermiology intertwine. This is pushed to a new limit by further invoking the coupling between spin and charge degrees of freedom, which fundamentally affects the principal nature of the Cooper pair wave function. We investigate the onset of superconductivity in the Rashba-Hubbard model on the triangular lattice, which is symmetry-classified by the associated irreducible representa…

Sky localization of Massive Black Hole Binaries in the foreground of Galactic white dwarf binaries
Pan Guo, Hong-Bo Jin, Cong-Feng Qiao, Yue-Liang Wu
https://arxiv.org/abs/2404.11505

Sky localization of Massive Black Hole Binaries in the foreground of Galactic white dwarf binaries
Quickly sky localizing of massive black hole binaries (MBHBs) from the foreground of double white dwarf (DWD) is essential for space-based gravitational wave (GW) detection. In an orbit period of the space crafts, there is an optimal orbital position of the GW detectors to observe GW sources, where the signal intensity is at its peak. From the model Q3-d, five MBHB sources are selected based on the optimal observation orbital positions of the GW detectors, which are associated with the orientat…

This https://arxiv.org/abs/2311.16268 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Gilbert damping in two-dimensional metallic anti-ferromagnets
A finite spin life-time of conduction electrons may dominate Gilbert damping of two-dimensional metallic anti-ferromagnets or anti-ferromagnet/metal heterostructures. We investigate the Gilbert damping tensor for a typical low-energy model of a metallic anti-ferromagnet system with honeycomb magnetic lattice and Rashba spin-orbit coupling for conduction electrons. We distinguish three regimes of spin relaxation: exchange-dominated relaxation for weak spin-orbit coupling strength, Elliot-Yafet r…

Spin conductances and magnetization production in chiral molecular junctions
Richard Koryt\'ar, Jan M. van Ruitenbeek, Ferdinand Evers
https://arxiv.org/abs/2404.05614

Spin conductances and magnetization production in chiral molecular junctions
Motivated by experimental reports on chirality induced spin selectivity, we investigate a minimal model that allows us to calculate the charge and spin conductances through helical molecules analytically. The spin-orbit interaction is assumed to be non-vanishing on the molecule and negligible in the reservoirs (leads). The band-structure of the molecule features four helical modes with spin-momentum locking that are analogous of edge-currents in the quantum spin Hall effect. While charge is con…

Batch Estimation of a Steady, Uniform, Flow-Field from Ground Velocity and Heading Measurements
Artur Wolek, James McMahon
https://arxiv.org/abs/2402.17078

Batch Estimation of a Steady, Uniform, Flow-Field from Ground Velocity and Heading Measurements
This paper presents three batch estimation methods that use noisy ground velocity and heading measurements from a vehicle executing a circular orbit (or similar large heading change maneuver) to estimate the speed and direction of a steady, uniform, flow-field. The methods are based on a simple kinematic model of the vehicle's motion and use curve-fitting or nonlinear least-square optimization. A Monte Carlo simulation with randomized flow conditions is used to evaluate the batch estimation met…

Advances in Atom Interferometry and their Impacts on the Performance of Quantum Accelerometers On-board Future Satellite Gravity Missions
Alireza HosseiniArania, Manuel Schilling, Quentin Beaufils, Annike Knabe, Benjamin Tennstedt, Alexey Kupriyanov, Steffen Sch\"on, Franck Pereira dos Santos, J\"urgen M\"uller
https://

Advances in Atom Interferometry and their Impacts on the Performance of Quantum Accelerometers On-board Future Satellite Gravity Missions
Recent advances in cold atom interferometry have cleared the path for space applications of quantum inertial sensors, whose level of stability is expected to increase dramatically with the longer interrogation times accessible in space. In this study, a comprehensive in-orbit model is developed for a Mach-Zehnder-type cold-atom accelerometer. Performance tests are realized under different assumptions, and the impact of various sources of errors on instrument stability is evaluated. Current and …

Cross-layer Modeling and Design of Content Addressable Memories in Advanced Technology Nodes for Similarity Search
Siri Narla, Piyush Kumar, Mohammad Adnaan, Azad Naeemi
https://arxiv.org/abs/2403.15328

Cross-layer Modeling and Design of Content Addressable Memories in Advanced Technology Nodes for Similarity Search
In this paper we present a comprehensive design and benchmarking study of Content Addressable Memory (CAM) at the 7nm technology node in the context of similarity search applications. We design CAM cells based on SRAM, spin-orbit torque, and ferroelectric field effect transistor devices and from their layouts extract cell parasitics using state of the art EDA tools. These parasitics are used to develop SPICE netlists to model search operations. We use a CAM-based dataset search and a sequential…

This https://arxiv.org/abs/2306.11870 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Mercury's chaotic secular evolution as a subdiffusive process
Mercury's orbit can destabilize, generally resulting in a collision with either Venus or the Sun. Chaotic evolution can cause g1 to decrease to the approximately constant value of g5 and create a resonance. Previous work has approximated the variation in g1 as stochastic diffusion, which leads to a phenomological model that can reproduce the Mercury instability statistics of secular and N-body models on timescales longer than 10 Gyr. Here we show that the diffusive model underpredicts the Mercu…

Decoherence in Andreev spin qubits
Silas Hoffman, Max Hays, Kyle Serniak, Thomas Hazard, Charles Tahan
https://arxiv.org/abs/2403.00710 https://

Decoherence in Andreev spin qubits
We theoretically study the dephasing of an Andreev spin qubit (ASQ) due to electric and magnetic noise. Using a tight-binding model, we calculate the Andreev states formed in a Josephson junction where the link is a semiconductor with strong spin-orbit interaction. As a result of both the spin-orbit interaction and induced superconductivity, the local charge and spin of these states varies as a function of externally controllable parameters: the phase difference between the superconducting lead…

Physics-Informed Neural Networks for Satellite State Estimation
Jacob Varey, Jessica D. Ruprecht, Michael Tierney, Ryan Sullenberger
https://arxiv.org/abs/2403.19736

Physics-Informed Neural Networks for Satellite State Estimation
The Space Domain Awareness (SDA) community routinely tracks satellites in orbit by fitting an orbital state to observations made by the Space Surveillance Network (SSN). In order to fit such orbits, an accurate model of the forces that are acting on the satellite is required. Over the past several decades, high-quality, physics-based models have been developed for satellite state estimation and propagation. These models are exceedingly good at estimating and propagating orbital states for non-m…

Sky localization of Massive Black Hole Binaries in the foreground of Galactic white dwarf binaries
Pan Guo, Hong-Bo Jin, Cong-Feng Qiao, Yue-Liang Wu
https://arxiv.org/abs/2404.11505

Sky localization of Massive Black Hole Binaries in the foreground of Galactic white dwarf binaries
Quickly sky localizing of massive black hole binaries (MBHBs) from the foreground of double white dwarf (DWD) is essential for space-based gravitational wave (GW) detection. In an orbit period of the space crafts, there is an optimal orbital position of the GW detectors to observe GW sources, where the signal intensity is at its peak. From the model Q3-d, five MBHB sources are selected based on the optimal observation orbital positions of the GW detectors, which are associated with the orientat…

Spin dynamics and possible topological magnons in non-stoichiometric pyrochlore iridate Tb$_2$Ir$_2$O$_7$ studied by RIXS
Q. Faure, A. Toschi, J. R. Soh, E. Lhotel, B. Detlefs, D. Prabhakaran, D. F. McMorrow, C. J. Sahle
https://arxiv.org/abs/2404.03829

Spin dynamics and possible topological magnons in non-stoichiometric pyrochlore iridate Tb$_2$Ir$_2$O$_7$ studied by RIXS
We report a resonant inelastic X-ray scattering study on a single crystal of a non-stoichiometric pyrochlore iridate Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$ ($x \simeq 0.25$) that magnetically orders at $T_{\rm{N}}\simeq 50$ K. We find that the strength of the spin-orbit coupling and the trigonal distortion of the IrO$_6$ octahedra are comparable with the ones obtained in other pyrochlore iridates. We observe a propagating gapped magnon mode at low energy, and model it using a Hamiltonian consisting of a…

This https://arxiv.org/abs/2306.11870 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Mercury's chaotic secular evolution as a subdiffusive process
Mercury's orbit can destabilize, generally resulting in a collision with either Venus or the Sun. Chaotic evolution can cause g1 to decrease to the approximately constant value of g5 and create a resonance. Previous work has approximated the variation in g1 as stochastic diffusion, which leads to a phenomological model that can reproduce the Mercury instability statistics of secular and N-body models on timescales longer than 10 Gyr. Here we show that the diffusive model underpredicts the Mercu…

Orbital-doublet-driven even spin Chern insulators
Lu Liu, Yuntian Liu, Jiayu Li, Hua Wu, Qihang Liu
https://arxiv.org/abs/2403.14893 https://

Orbital-doublet-driven even spin Chern insulators
Quantum spin Hall insulators hosting edge spin currents hold great potential for low-power spintronic devices. In this work, we present a universal approach to achieve a high and near-quantized spin Hall conductance plateau within a sizable bulk gap. Using a nonmagnetic four-band model Hamiltonian, we demonstrate that an even spin Chern (ESC) insulator can be accessed by tuning the sign of spin-orbit coupling (SOC) within a crystal symmetry-enforced orbital doublet. With the assistance of a hig…

This https://arxiv.org/abs/2402.07533 has been replaced.
initial toot: https://mastoxiv.page/@a…

Tuning proximity spin-orbit coupling in graphene/NbSe$_2$ heterostructures via twist angle
We investigate the effect of the twist angle on the proximity spin-orbit coupling (SOC) in graphene/NbSe$_2$ heterostructures from first principles. The low-energy Dirac bands of several different commensurate twisted supercells are fitted to a model Hamiltonian, allowing us to study the twist-angle dependency of the SOC in detail. We predict that the magnitude of the Rashba SOC can triple, when going from $Θ=0^\circ$ to $Θ=30^\circ$ twist angle. Furthermore, at a twist angle of $Θ\approx23^…

This https://arxiv.org/abs/2403.05051 has been replaced.
initial toot: https://mastoxiv.page/@a…

Superconductivity in Two-Dimensional Systems with Unconventional Rashba Bands
In two-dimensional system with Rashba spin-orbit coupling, it is well-known that superconductivity can have mixed spin-singlet and -triplet parity, and the $\boldsymbol{d}$-vector of spin-triplet pairing is parallel to $\boldsymbol{g}$-vector of Rashba spin-orbit coupling. Here, we propose a model to describe a two-dimensional system with unconventional Rashba bands and study its superconductivity. We show that the $\boldsymbol{d}$-vector of spin-triplet pairing can be either parallel or perpen…

This https://arxiv.org/abs/2404.05614 has been replaced.
initial toot: https://mastoxiv.page/@a…

Spin conductances and magnetization production in chiral molecular junctions
Motivated by experimental reports on chirality induced spin selectivity, we investigate a minimal model that allows us to calculate the charge and spin conductances through helical molecules analytically. The spin-orbit interaction is assumed to be non-vanishing on the molecule and negligible in the reservoirs (leads). The band-structure of the molecule features four helical modes with spin-momentum locking that are analogous of edge-currents in the quantum spin Hall effect. While charge is con…

Orbital-doublet-driven even spin Chern insulators
Lu Liu, Yuntian Liu, Jiayu Li, Hua Wu, Qihang Liu
https://arxiv.org/abs/2403.14893 https://

Orbital-doublet-driven even spin Chern insulators
Quantum spin Hall insulators hosting edge spin currents hold great potential for low-power spintronic devices. In this work, we present a universal approach to achieve a high and near-quantized spin Hall conductance plateau within a sizable bulk gap. Using a nonmagnetic four-band model Hamiltonian, we demonstrate that an even spin Chern (ESC) insulator can be accessed by tuning the sign of spin-orbit coupling (SOC) within a crystal symmetry-enforced orbital doublet. With the assistance of a hig…

This https://arxiv.org/abs/2404.15605 has been replaced.
link: https://scholar.google.com/scholar?q=a

Magnetic flux-induced topological superconductivity in magnetic atomic rings
There have been numerous studies on topological superconductivity in magnetic atomic chains deposited on s-wave superconductors. Most of these investigations have focused on spin-orbit interactions or helical spin orders. In this paper, we propose a new model for achieving one-dimensional topological superconductivity in a magnetic atomic ring. This model utilizes a magnetic field and an antiferromagnetic/ferromagnetic order, under the condition that the magnetic field is perpendicular to the m…

Supercurrent Diode Effect in Helical Superconductors
Jaglul Hasan, Daniel Shaffer, Maxim Khodas, Alex Levchenko
https://arxiv.org/abs/2404.17072 https://…

Supercurrent Diode Effect in Helical Superconductors
In this work, we explore the generalities of the supercurrent diode effect. As an illustrative example, we examine a model of a two-dimensional superconductor with Rashba-type spin-orbit coupling under an in-plane magnetic field and in the clean limit, which realizes a helical phase. First, we utilize Ginzburg-Landau phenomenology to derive a general formula for the diode efficiency. This is achieved by incorporating higher gradient terms in the Lifshitz invariants, which are responsible for th…

This https://arxiv.org/abs/2307.15652 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Spin Hall conductivity in the Kane-Mele-Hubbard model at finite temperature
The Kane-Mele model is known to show a quantized spin Hall conductivity at zero temperature. Including Hubbard interactions at each site leads to a quantum phase transition to an XY antiferromagnet at sufficiently high interaction strength. Here, we use the two-particle self-consistent approach (TPSC), which we extend to include spin-orbit coupling, to investigate the Kane-Mele-Hubbard model at finite temperature and half-filling. TPSC is a weak to intermediate coupling approach capable of calc…

This https://arxiv.org/abs/2306.11870 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Mercury's chaotic secular evolution as a subdiffusive process
Mercury's orbit can destabilize, generally resulting in a collision with either Venus or the Sun. Chaotic evolution can cause g1 to decrease to the approximately constant value of g5 and create a resonance. Previous work has approximated the variation in g1 as stochastic diffusion, which leads to a phenomological model that can reproduce the Mercury instability statistics of secular and N-body models on timescales longer than 10 Gyr. Here we show that the diffusive model underpredicts the Mercu…

Effects of spin-orbit coupling in a valley chiral kagom\'e network
P. Wittig, F. Dominguez, P. Recher
https://arxiv.org/abs/2403.10181 https://<…

Effects of spin-orbit coupling in a valley chiral kagomé network
Valley chiral kagomé networks can arise in various situations, like for example, in double-aligned graphene-hexagonal boron nitride and periodically strained graphene. Here, we construct a phenomenological scattering model based on the symmetries of the network to investigate the energy spectrum and magnetotransport in this system. Additionally, we consider the effects of a finite Rashba spin-orbit coupling on the transport properties of the kagomé network. We identify conditions where the in…

Intrinsic anomalous and crystal Hall effects in altermagnets
Lotan Attias, Alex Levchenko, Maxim Khodas
https://arxiv.org/abs/2402.12115 https://

Intrinsic anomalous and crystal Hall effects in altermagnets
We construct the tight-binding model of the altermagnet in the presence of a finite spin-orbit interaction. As a concrete example, we have studied the collinear FeSb$_2$. The Fe ions form two sublattices with opposite spin polarization. Inclusion of the intra-sublattice hopping amplitudes up to the next-to-nearest neighbor results in the generic model free of accidental degeneracies. The zero spin-orbit interaction limit is achieved by elimination of spin dependent hopping amplitudes. The addit…

The phase curve of the ultra-hot Jupiter WASP-167b as seen by TESS
Sz. K\'alm\'an, A. Derekas, Sz. Csizmadia, A. P\'al, R. Szab\'o, A. M. S. Smith, K. Nagy, V. Heged\H{u}s, T. Mitnyan, L. Szigeti, Gy. M. Szab\'o
https://arxiv.org/abs/2403.19468

The phase curve of the ultra-hot Jupiter WASP-167b as seen by TESS
Ultra-hot Jupiters (UHJs) orbiting pulsating A/F stars represent an important subset of the exoplanetary demographic, as they are excellent candidates for the study of exoplanetary atmospheres, as well as being astrophysical laboratories for the investigation of planet-to-star interactions. We analyse the \texttt{TESS} (Transiting Exoplanet Survey Satellite) light curve of the WASP-167 system, consisting of an F1V star and a substellar companion on a $\sim 2.02$ day orbit. We model the combinat…

This https://arxiv.org/abs/2212.00199 has been replaced.
link: https://scholar.google.com/scholar?q=a

Evidence of $ϕ$0-Josephson junction from skewed diffraction patterns in Sn-InSb nanowires
We study Josephson junctions based on InSb nanowires with Sn shells. We observe skewed critical current diffraction patterns: the maxima in forward and reverse current bias are at different magnetic flux, with a displacement of 20-40 mT. The skew is greatest when the external field is nearly perpendicular to the nanowire, in the substrate plane. This orientation suggests that spin-orbit interaction plays a role. We develop a phenomenological model and perform tight-binding calculations, both me…

Origins of temperature-dependent magnetism in open-shell 4$d$ and 5$d$ halide perovskites
Ying Li, Ram Seshadri, Stephen D. Wilson, Anthony K. Cheetham, Roser Valenti
https://arxiv.org/abs/2402.14064

Origins of temperature-dependent magnetism in open-shell 4$d$ and 5$d$ halide perovskites
A few $4d$ and $5d$ transition metal compounds with various electron fillings were recently found to exhibit magnetic susceptibilities $χ$ and magnetic moments that deviate from the well-established Kotani model. This model has been considered for decades to be the canonical expression to describe the temperature dependence of magnetism in systems with non-negligible spin-orbit coupling effects. In this work, we uncover the origin of such discrepancies and determine the applicability and limit…

$J=1/2$ Pseudospins and $d$-$p$ Hybridization in the Kitaev Spin Liquid Candidates Ru$X_3$ ($X$ = Cl, Br, I)
H. Gretarsson, H. Fujihara, F. Sato, H. Gotou, Y. Imai, K. Ohgushi, B. Keimer, H. Suzuki
https://arxiv.org/abs/2402.18783

$J=1/2$ Pseudospins and $d$-$p$ Hybridization in the Kitaev Spin Liquid Candidates Ru$X_3$ ($X$ = Cl, Br, I)
The recent synthesis of ruthenium trihalides Ru$X_3$ ($X$ = Cl, Br, I) has enlarged the set of material candidates for Kitaev spin liquid. The realization of Kitaev model necessitates the formation of $J=1/2$ pseudospins in the octahedral crystal field. We use Ru $L_3$-edge resonant inelastic x-ray scattering to investigate the evolution of multiplet structures in Ru$X_3$. We identified quasi-elastic magnetic correlations and spin-orbit transitions to the $J=3/2$ states without discernible trig…