A5026830181- Topological Materials and Phenomena
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Gamma-ray bursts and supernovae
- Quantum and electron transport phenomena
- Pulsars and Gravitational Waves Research
- 2D Materials and Applications
- Astrophysics and Cosmic Phenomena
- Electronic and Structural Properties of Oxides
- Astrophysical Phenomena and Observations
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Surface and Thin Film Phenomena
- Advanced Condensed Matter Physics
- Magnetic Field Sensors Techniques
- Photorefractive and Nonlinear Optics
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor materials and devices
- Nonlinear Optical Materials Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Magnetic properties of thin films
- Stellar, planetary, and galactic studies
- Laser Material Processing Techniques
- Quantum Mechanics and Non-Hermitian Physics
- Rare-earth and actinide compounds
First Affiliated Hospital of Henan University
2025
Max Planck Institute for Gravitational Physics
2024
Peking University
2012-2024
Zunyi Medical University
2024
ShangHai JiAi Genetics & IVF Institute
2022-2024
Collaborative Innovation Center of Quantum Matter
2015-2024
Fudan University
2020-2024
State Key Laboratory of Surface Physics
2020-2024
Hefei University
2023-2024
Beijing Academy of Quantum Information Sciences
2021-2023
Abstract We report deep Chandra X-ray Observatory ( CXO ), Hubble Space Telescope HST and Karl J. Jansky Very Large Array (VLA) observations of the binary neutron star event GW170817 at t < 160 days after merger. These show that has been steadily brightening with time might have now reached its peak, constrain emission process as non-thermal synchrotron where cooling frequency ν c is above band m below radio band. The very simple power-law spectrum extending for eight orders magnitude in...
Observations of long-distance magnon transport---the propagation quantized spin waves---demonstrate that 2D van der Waals magnets could provide a platform for information and computing applications based on magnonics.
Abstract We present numerical simulations of energetic flows propagating through the debris cloud a binary neutron star (BNS) merger. Starting from scale central engine, we use moving-mesh hydrodynamics code to simulate complete dynamical evolution relativistic jets produced. compute synchrotron emission directly and multiband light curves early (subday) late (weeks years) afterglow stages. Our work systematically compares two distinct models for referred as narrow- wide-engine scenarios,...
Abstract We present Chandra and Very Large Array observations of GW170817 at ∼521–743 days post-merger, a homogeneous analysis the entire data set. find that late-time nonthermal emission follows expected evolution an off-axis relativistic jet, with steep temporal decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>F</mml:mi> </mml:mrow> <mml:mi>ν</mml:mi> </mml:msub> <mml:mo>∝</mml:mo> <mml:msup> <mml:mi>t</mml:mi>...
The Goos-Hänchen (GH) shift and the Imbert-Fedorov (IF) are optical phenomena which describe longitudinal transverse lateral shifts at reflection interface, respectively. Here, we predict GH IF in Weyl semimetals (WSMs)-a promising material harboring low energy fermions, a massless fermionic cousin of photons. Our results show that WSMs is valley independent, analogous to discovered 2D relativistic material-graphene. However, has never been explored nonoptical systems, here it dependent....
We present new observations of the binary neutron star merger GW170817 at $\Delta t\approx 220-290$ days post-merger, radio (Karl G. Jansky Very Large Array; VLA), X-ray (Chandra Observatory) and optical (Hubble Space Telescope; HST) wavelengths. These provide first evidence for a turnover in light curve, mirroring decline emission $\gtrsim5\sigma$ significance. The radio-to-X-ray spectral energy distribution exhibits no evolution into declining phase. Our full multi-wavelength dataset is...
For the first $\sim3$ years after binary neutron star merger event GW 170817 radio and X-ray radiation has been dominated by emission from a structured relativistic off-axis jet propagating into low-density medium with n $< 0.01\,\rm{cm^{-3}}$. We report on observational evidence for an excess of at $\delta t>900$ days merger. With $L_x\approx5\times 10^{38}\,\rm{erg\,s^{-1}}$ 1234 days, recently detected represents $\ge 3.2\,\sigma$ (Gaussian equivalent) deviation universal post jet-break...
Superconductor-ferromagnet (S-F) interfaces in two-dimensional (2D) heterostructures present a unique opportunity to study the interplay between superconductivity and ferromagnetism. The realization of such nanoscale van der Waals (vdW) crystals remains largely unexplored due challenge making an atomically-sharp interface from their layered structures. Here, we build vdW ferromagnetic Josephson junction (JJ) by inserting few-layer insulator Cr2Ge2Te6 into two layers superconductor NbSe2....
The nature of the anomalous metal state has been a major puzzle in condensed matter physics for more than three decades. Here, we report systematic investigation and modulation states high-temperature interface superconductor FeSe films on ${\mathrm{SrTiO}}_{3}$ substrate. Remarkably, under zero magnetic field, persists up to 20 K pristine films, an exceptionally high temperature standing out from previous observations. In stark contrast, with nanohole arrays, characteristic is considerably...
Abstract Transition metal compounds with kagome structure have been found to exhibit a variety of exotic structural, electronic, and magnetic orders. These orders are competing energies very close each other, resulting in complex phase transitions. Some the phases easily observable, such as charge density wave (CDW) superconducting phase, while others more challenging identify characterize. Here we present magneto-transport evidence new below ~ 35 K topological CsV 3 Sb 5 (CVS) thin flakes...
In most cases, to observe quantized Hall plateaus, an external magnetic field is applied in intrinsic topological insulators MnBi_{2}Te_{4}. Nevertheless, whether the nonzero Chern number (C≠0) phase a quantum anomalous (QAH) state, or (QH) mixing state of both still puzzle, especially for recently observed C=2 [Deng et al., Science 367, 895 (2020)SCIEAS0036-807510.1126/science.aax8156]. this Letter, we propose physical picture based on Anderson localization understand plateaus disordered...
Abstract We present a revised and complete optical afterglow light curve of the binary neutron star merger GW170817, enabled by deep Hubble Space Telescope ( HST ) F606W observations at ≈584 days post-merger, which provide robust template. The spans ≈110–362 days, is fully consistent with emission from relativistic structured jet viewed off-axis, as previously indicated radio X-ray data. Combined contemporaneous observations, we find no spectral evolution, weighted average index <mml:math...
The Stokes-Einstein relation for the self-diffusion coefficient of a spherical particle suspended in an incompressible fluid is asymptotic result limit large Schmidt number, that is, when momentum diffuses much faster than particle. When number moderate, which happens most methods hydrodynamics, deviations from prediction are expected. We study these corrections computationally using recently developed minimally resolved method coupling particles to fluctuating both two and three dimensions....
Metal-insulator transitions driven by magnetic fields have been extensively studied in 2D, but a 3D theory is still lacking. Motivated recent experiments, we develop scaling for the metal-insulator strong-magnetic-field quantum limit of system. By using renormalization-group calculation to treat electron-electron interactions, electron-phonon and disorder on same footing, obtain critical exponent that characterizes relations resistivity temperature field. comparing with those experiment [F....
We study the disordered topological Anderson insulator in a two-dimensional (square not strip) geometry. first report phase diagram of finite systems and then evolution boundaries when system size is increased to very large $1120\ifmmode\times\else\texttimes\fi{}1120$ area. establish that conductance quantization can occur without bulk band gap, there are two distinct scaling regions with quantized conductance: TAI-I TAI-II localized states. show no intervening insulating between conduction...
In this paper, we numerically study the magnetic transport properties of disordered Weyl semimetals (WSM) in ultraquantum limit. We find a positive conductivity for long-range disorder, although system tends to have negative weak short-range disorder. Remarkably, such usually cannot be described by semiclassical Boltzmann theory even disorder limit, and backscattering assisted high Landau levels is always important. Our results significant implications recently discovered WSM systems, point...
We investigate the laser-induced damage performance at 1064 nm of potassium dihydrogen phosphate (KDP) crystals grown using filters different pore sizes. The aim is to explore a novel method for understanding laser–matter interactions with regard physical parameters affecting ability precursors initiate damage. By reducing size in continuous filtration growth, we can improve laser resistance. Furthermore, develop model based on Gaussian distribution precursor thresholds and heat transfer...
Abstract WTe2, as a type-II Weyl semimetal, has 2D Fermi arcs on the (001) surface in bulk and 1D helical edge states its monolayer. These features have recently attracted wide attention condensed matter physics. However, intermediate regime between monolayer, not been resolved owing to closed band gap which makes dominant. Here, we report signatures of superconductivity by superconducting quantum interference measurements multilayer WTe2 Josephson junctions directly map localized...
Recently, there has been significant interest in topological nodal-line semimetals due to their linear energy dispersion with one-dimensional nodal lines or loops. These materials exhibit fascinating physical properties, such as drumhead surface states and 3D anisotropic structures. Similar Weyl semimetals, type-II have two crossing bands that are both electron-like hole-like along a certain direction. However, the direct observation of Fermions challenging lack suitable material platforms...
By finding local minima of a thermodynamic-like potential, we generate jammed packings frictionless spheres under constant shear stress σ and obtain the yield σy by sampling potential energy landscape. For three-dimensional systems with harmonic repulsion, satisfies finite size scaling limiting relation σy∼ϕ-ϕc,∞, where ϕc,∞ is critical volume fraction jamming transition at σ=0 in thermodynamic limit. The implies length ξ∼(ϕ-ϕc,∞)-ν ν=0.81±0.05, which turns out to be robust universal scale...
Rapid growth processing of KDP crystals was improved by employing continuous filtration to eliminate bulk defects. The performances the crystals, including scattering defects, laser damage resistance and transmittance, were measured analyzed. Compared with rapid-grown without filtration, transmittance in near-infrared increased at least 2%, almost all ‘micron size’ defects eliminated ‘sub-micron decreased approximately 90%. Laser testing revealed that laser-induced thresholds (LIDTs), as...
Using nonlinear, fully relativistic, simulations we investigate the dynamics and gravitational-wave signature associated with instabilities in neutron star postmerger remnants. For simplified models of remnant establish presence an instability stars moderate $T/|W|$, ratio between kinetic gravitational potential energies. Detailed analysis density oscillation pattern reveals a \emph{local} inner region more realistic differential rotation profile. We apply Rayleigh's inflection theorem...