Tootfinder

Bulk Nanostructured Zirconia Ceramics with High Hardness and Toughness via Integration of High-Pressure Torsion and Spark Plasma Sintering
Kaveh Edalati, Koji Morita, Shivam Dangwal, Zenji Horita
https://arxiv.org/abs/2507.22298

Bulk Nanostructured Zirconia Ceramics with High Hardness and Toughness via Integration of High-Pressure Torsion and Spark Plasma Sintering
Developing nanostructured bulk ceramics is a major challenge when conventional high-temperature sintering is employed for consolidation. In the current investigation, yttria-stabilized zirconia (YSZ) with a composition of ZrO2 - 3 mol% Y2O3 is first treated using high-pressure torsion (HPT) and further consolidated using spark plasma sintering (SPS) to produce a nanostructured bulk sample. The material demonstrates phase transformations from tetragonal to dislocation-decorated monoclinic by HPT…

Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence
M. Mootz, C. Vaswani, C. Huang, K. J. Lee, A. Khatri, P. Mandal, J. H. Kang, L. Luo, I. E. Perakis, C. B. Eom, J. Wang
https://arxiv.org/abs/2507.22383

Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence
Overcoming the decoherence bottleneck remains a central challenge for advancing coherent superconducting quantum device and information technologies. Solitons -- non-dispersive wave packets stabilized by the collective synchronization of quantum excitations -- offer a robust pathway to mitigating dephasing, yet their realization in superconductors has remained experimentally elusive. Here, we report the observation of a driven soliton state in epitaxial thin films of an iron-based superconducto…

Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars
J. Blunier, A. Neronov, D. Semikoz
https://arxiv.org/abs/2506.22285

Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars
Joint observations of extreme blazars with Fermi Large Area Telescope (LAT) and Imaging Atmospheric Cherenkov telescopes (IACT) have been previously used to derive lower bounds on intergalactic magnetic field (IGMF). We update these previous bounds using a set of extreme blazars that are detected in the Very-High-Energy (VHE, photon energies above 100 GeV) band by both Fermi/LAT and IACTs. We measure IGMF-dependent suppression of secondary delayed gamma-ray flux from electron-positron pairs dep…

Signatures of rigidity and second sound in dipolar supersolids
G. A. Bougas, T. Bland, H. R. Sadeghpour, S. I. Mistakidis
https://arxiv.org/abs/2506.22290 …

Signatures of rigidity and second sound in dipolar supersolids
We propose a dynamical protocol to probe the rigidity and phase coherence of dipolar supersolids by merging initially separated fragments in quasi-one-dimensional (1D) double-well potentials. Simulations based on the extended Gross-Pitaevskii equation reveal distinct dynamical signatures across phases. Supersolids exhibit damped crystal oscillations following barrier removal, with the damping rate reflecting superfluid connectivity. A phase-imprinted jump additionally triggers metastable dark s…

Nonlocal-coupling-based control of coherence resonance
Aleksey Ryabov, Elena Rybalova, Andrei Bukh, Tatiana E. Vadivasova, Vladimir V. Semenov
https://arxiv.org/abs/2506.22909

Nonlocal-coupling-based control of coherence resonance
We demonstrate that nonlocal coupling enables control of the collective stochastic dynamics in the regime of coherence resonance. The control scheme based on the nonlocal interaction properties is presented by means of numerical simulation on an example of coupled FitzHugh-Nagumo oscillators. In particular, increasing the coupling radius is shown to enhance or to suppress the effect of coherence resonance which is reflected in the evolution of the dependence of the correlation time and the devi…

Spin-Polaron Mediated Superconductivity in Doped Chern Antiferromagnets
Xuepeng Wang, J. F. Mendez-Valderrama, Johannes S. Hofmann, Debanjan Chowdhury
https://arxiv.org/abs/2507.22971

Spin-Polaron Mediated Superconductivity in Doped Chern Antiferromagnets
The study of interacting topological bands with a tunable bandwidth offers a unique platform to study the interplay of intertwined orders and emergent non-electronic excitations. Here we design a time-reversal symmetric and sign-problem-free electronic model with tunable Chern bands carrying valley-contrasting Chern number, interacting via competing (anti-)ferromagnetic interactions. Using numerically exact quantum Monte-Carlo computations, we analyze the many-body phase-diagram as a function o…

Measuring coherence factors of states in superconductors through local current
Rodrigo A. Dourado, Jeroen Danon, Martin Leijnse, Rub\'en Seoane Souto
https://arxiv.org/abs/2507.20696

Measuring coherence factors of states in superconductors through local current
The coherence factors of quasiparticles in a superconductor determine their properties, including transport and susceptibility to electric fields. In this work, we propose a way to infer the local coherence factors using local transport to normal leads. Our method is based on measuring the local current through a lead as the coupling to a second one is varied: the shape of the current is determined by the ratio between the local coherence factors, becoming independent of the coupling to the sec…

Coherence of dipole-forbidden Rydberg excitons in Cu$_2$O measured by polarization- and time-resolved multi-photon spectroscopy
A. Farenbruch, N. V. Siverin, G. Uca, D. Fr\"ohlich, D. R. Yakovlev, M. Bayer
https://arxiv.org/abs/2507.22717

Coherence of dipole-forbidden Rydberg excitons in Cu$_2$O measured by polarization- and time-resolved multi-photon spectroscopy
Quantum applications of solid state systems base upon generation and control of coherent electronic excitations. Prominent examples are exciton states in semiconductors excitable by photons. The high oscillator strength of electric-dipole (ED) allowed exciton states favors their efficient coherent generation, but limits also their lifetime. ED-forbidden exciton states with long recombination times might maintain long-lived coherence, especially in highly-quality crystals with suppressed exciton…

The Coherent Multiplex: Scalable Real-Time Wavelet Coherence Architecture
Noah Shore
https://arxiv.org/abs/2508.19994 https://arxiv.org/pdf/2508.19994

The Coherent Multiplex: Scalable Real-Time Wavelet Coherence Architecture
The Coherent Multiplex is formalized and validated as a scalable, real-time system for identifying, analyzing, and visualizing coherence among multiple time series. Its architecture comprises a fast spectral similarity layer based on cosine similarity metrics of Fourier-transformed signals, and a sparse time-frequency layer for wavelet coherence. The system constructs and evolves a multilayer graph representing inter-signal relationships, enabling low-latency inference and monitoring. A simulat…

Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
Iku Nakaaki, Aoi Hashimoto, Shun Kondo, Yuichi Ikuhara, Shuuichi Ooi, Minoru Tachiki, Shunichi Arisawa, Akiko Nakamura, Taku Moronaga, Jun Chen, Hiroyo Segawa, Takahiro Sakurai, Hitoshi Ohta, Takashi Uchino
https://…

Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
Recently, we have reported that a highly disordered fractal MgO/MgB2 nanocomposite exhibits bulk-like superconducting properties with isotropic pinning, showing an excellent phase-coherent capability irrespective of the low volume fraction (~30 vol. %) of MgB2 [Uchino et al., Phys. Rev. B 101, 035146 (2020); Teramachi et al,, Phys. Rev. B 108, 155146 (2023)]. Hence, this nanocomposite provides a useful experimental system to investigate the relationship between the structural disorder and the e…