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Diverse Manifestations of Electron-Phonon Coupling in a Kagome Superconductor

Physical Review Letters 2025年第10期134卷 106401-106401页

作者： Jing-Yang You Chih-En Hsu Mauro Del Ben Zhenglu Li Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles California 90089 USA Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Singapore Department of Physics Tamkang University Tamsui New Taipei 251301 Taiwan Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Recent angle-resolved photoemission spectroscopy (ARPES) experiments on the kagome metal CsV3Sb5 revealed distinct multimodal dispersion kinks and nodeless superconducting gaps across multiple electron bands. The prominent photoemission kinks suggest a definitive coupling between electrons and certain collective modes, yet the precise nature of this interaction and its connection to superconductivity remain to be established. Here, employing the state-of-the-art ab initio many-body perturbation theory computation, we present direct evidence that electron-phonon (e-ph) coupling induces the multimodal photoemission kinks in CsV3Sb5, and profoundly, drives the nodeless s-wave superconductivity, showcasing the diverse manifestations of the e-ph coupling. Our calculations well capture the experimentally measured kinks and their fine structures, and reveal that vibrations from different atomic species dictate the multimodal behavior. Results from anisotropic GW-Eliashberg equations predict a phonon-mediated superconductivity with nodeless s-wave gaps, in excellent agreement with various ARPES and scanning tunneling spectroscopy measurements. Despite the universal origin of the e-ph coupling, the contributions of several characteristic phonon vibrations vary in different phenomena, highlighting a versatile role of e-ph coupling in shaping the low-energy excitations of kagome metals.

关键词： Shear waves

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Three-Dimensional PIC-MC Modeling for Relativistic Electron Beam Transport Through Dense Plasma

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Plasma Science and Technology 2008年第1期10卷 18-21页

作者：曹莉华常铁强裴文兵刘占军李蒙郑春阳 Institute of Applied Physics and Computational Mathematics Beijing 100088 China

We have developed a three dimensional （3D） PIC （particle-in-cell）-MC （Monte Carlo） code in order to simulate an electron beam transported into the dense matter based on our previous two dimensional code. The relativistic motion of fast electrons is treated by the particle-in-cell method under the influence of both a self-generated transverse magnetic field and an axial electric field, as well as collisions. The electric field generated by return current is expressed by Ohm＇s law and the magnetic field is calculated from Faraday＇s law. The slowing down of monoenergy electrons in DT plasma is calculated and discussed.

关键词： electron beam transport PIC simulation energy deposition

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Scattering of light waves by electron electrostatic waves in laser produced plasmas

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Chinese physics B 2010年第7期19卷 358-361页

作者：刘占军项江郑春阳朱少平曹莉华贺贤土王宇钢 Center for Applied Physics and Technology State Key Laboratory of Nuclear Physics and TechnologyPeking University Institute of Applied Physics and Computational Mathematics

The propagation of light waves in an underdense plasma is studied using one-dimensional Vlasov-Maxwell numerical simulation. It is found that the light waves can be scattered by electron plasma waves as well as other heavily and weakly damping electron wave modes, corresponding to stimulated Raman and Brilluoin-like scatterings. The stimu- lated electron acoustic wave scattering is also observed as a high scattering level. High frequency plasma wave scattering is also observed. These electron electrostatic wave modes are due to a non-thermal electron distribution produced by the wave-particle interactions. The collision effects on stimulated electron acoustic wave and the laser intensity effects on the scattering spectra are also investigated.

关键词： scatterings laser plasma Vlasov simulation

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NONLINEAR DYNAMICAL ANALYSIS OF BIFURCATION AND CONFLUENCE OF THE PACIFIC WESTERN BOUNDARY CURRENTS

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Journal of Hydrodynamics 2012年第3期24卷 383-390页

作者： NI Guo-xi JIANG Song JU Qiang-chang KONG Ling-hai LCP Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper, we analyze the bifurcation and the confluence of the Pacific western boundary currents by an analytical approach. Applying the conservation law, the geostrophic balance relation and the Bernoulli integral to a reduced gravity model, we get a quantitative relation for the outflow and the inflow, and establish the related formulae for the width and the veering angle of offshore currents under the inflow condition. Furthermore, a comparison between the volume transport based on the observation data and the analytical value for the Pacific western boundary currents is presented, which validates the theoretical analysis.

关键词： Pacific western boundary currents bifurcation confluence volume transport reduced gravity model

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THEORETICAL ANALYSES ON DISCRETE FORMULAE OF DIRECTIONAL DIFFERENTIALS IN THE FINITE POINT METHOD

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Journal of computational mathematics 2022年第1期40卷 1-25页

作者： Guixia Lv Longjun Shen Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.0.Box 8009-26Beijing 100088China

For the five-point discrete formulae of directional derivatives in the finite point method,overcoming the challenge resulted from scattered point sets and making full use of the explicit expressions and accuracy of the formulae,this paper obtains a number of theoretical results:(1)a concise expression with definite meaning of the complicated directional difference coefficient matrix is presented,which characterizes the correlation between coefficients and the connection between coefficients and scattered geometric characteristics;(2)various expressions of the discriminant function for the solvability of numerical differentials along with the estimation of its lower bound are given,which are the bases for selecting neighboring points and making analysis;(3)the estimations of combinatorial elements and of each element in the directional difference coefficient matrix are put out,which exclude the existence of ***,the theoretical analysis results are verified by numerical *** results of this paper have strong regularity,which lay the foundation for further research on the finite point method for solving partial differential equations.

关键词： Finite point method Finite difference Scattered point distribution Discrete directional differentials Theoretical analysis

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Supersonic flow kinetics: Mesoscale structures, thermodynamic nonequilibrium effects and entropy production mechanisms

arXiv

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arXiv 2025年

作者： Gan, Yanbiao Zhuang, Zhaowen Yang, Bin Xu, Aiguo Zhang, Dejia Chen, Feng Song, Jiahui Wu, Yanhong Hebei Key Laboratory of Trans-Media Aerial Underwater Vehicle North China Institute of Aerospace Engineering Langfang065000 China School of Energy and Safety Engineering Tianjin Chengjian University Tianjin300384 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P. O. Box 8009-26 Beijing100088 China National Key Laboratory of Shock Wave and Detonation Physics Mianyang621999 China HEDPS Center for Applied Physics and Technology College of Engineering Peking University Beijing100871 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China School of Physical Science and Technology Guangxi University Nanning530004 China School of Aeronautics Shan Dong Jiaotong University Jinan250357 China School of Aerospace Engineering Beijing Institute of Technology Beijing100081 China

Supersonic flow is a typical nonlinear, nonequilibrium, multiscale, and complex phenomenon. Compared to scenarios described by Navier-Stokes (NS) theory, mesoscale behavior in supersonic flow exhibits greater discreteness and a higher degree of nonequilibrium. Meanwhile, the entropy production mechanism, which involves compression efficiency and the ability to perform external work, is a significant focus in supersonic flow fields. As the degree of discrete/nonequilibrium effects increases, the study of entropy production based on NS theory may need reevaluation and appropriate revision. To address these issues, this paper develops and applies the discrete Boltzmann modeling and analysis method/model (DBM), based on kinetic and mean-field theories, to simulate, and analyze these phenomena. The study provides the following results: A Burnett-level DBM suitable for supersonic flow is constructed based on the Shakhov-BGK model. Higher-order analytical expressions for typical thermodynamic nonequilibrium effects are derived, providing a constitutive basis for improving traditional macroscopic hydrodynamics modeling. Criteria for evaluating the validity of DBM are established by comparing numerical and analytical solutions of nonequilibrium effects. The multiscale DBM is used to investigate discrete/nonequilibrium characteristics and entropy production mechanisms in shock regular reflection. The findings include: (a) Compared to the NS-level DBM, the Burnett-level DBM offers more accurate representations of viscous stress and heat flux, i.e., more precise dissipative mechanisms, ensures non-negativity of entropy production in accordance with the second law of thermodynamics, and exhibits better numerical stability. (b) Near the interfaces of incident and reflected shock waves, strong nonequilibrium driving forces lead to prominent nonequilibrium effects. By monitoring the timing and location of peak nonequilibrium quantities, the evolution characteristics of incident and

关键词： Supersonic flow

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AINV AND BILUM PRECONDITIONING TECHNIQUES

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applied mathematics and Mechanics(English Edition) 2004年第9期25卷 1012-1021页

作者：谷同祥迟学斌刘兴平 Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Supercomputing Center of Computer Network Information Center Chinese Academy of Science

It was proposed that a robust and efficient parallelizable preconditioner for solving general sparse linear systems of equations, in which the use of sparse approximate inverse (AINV) techniques in a multi-level block ILU (BILUM) preconditioner were investigated. The resulting preconditioner retains robustness of BILUM preconditioner and has two advantages over the standard BILUM preconditioner: the ability to control sparsity and increased parallelism. Numerical experiments are used to show the effectiveness and efficiency of the new preconditioner.

关键词： sparse matrix preconditioning technique BILUM AINV Krylov subspace method

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Successive Picket Drive for Mitigating the Ablative Richtmyer–Meshkov Instability

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Chinese physics Letters 2019年第2期36卷 28-31页

作者： Meng Li Wen-Hua Ye Institute of Applied Physics and Computational Mathematics Center for Applied Physics and Technology HEDPS Peking University

The ablative Richtmyer–Meshkov instability(ARMI) is crucial to the successful ignition implosion of the inertial confinement fusion(ICF) because of its action as the seed of the Rayleigh–Taylor instability. In usual ICF implosions, the first shock driven by various foots of the pulses plays a central role in the ARMI growth. We propose a new scheme for refraining from ARMI with a pulse of successive pickets. With the successive-picket pulse design, a rippled capsule surface is compressed by three successive shocks with sequentially strengthening intensities and ablated stabilization, and the ablative Richtmyer–Meshkov growth is mitigated quite *** numerical simulations and theoretical analyses identify the validity of this scheme.

关键词： RMI ICF Successive Picket Drive for Mitigating the Ablative Richtmyer Meshkov Instability

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Review of the current status of fast ignition research atthe IAPCM

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High Power Laser Science and Engineering 2014年第1期2卷 4-12页

作者： Hong-bo Cai Si-zhong Wu Jun-feng Wu Mo Chen Hua Zhang Min-qing He Li-hua Cao Cang-tao Zhou Shao-ping Zhu Xian-tu He Institute of Applied Physics and Computational Mathematics Center for Applied Physics and Technology Peking University

We review the present status and future prospects of fast ignition(FI) research of the theoretical group at the IAPCM(institute of applied physics and computational mathematics, Beijing) as a part of the inertial confinement fusion project. Since the approval of the FI project at the IAPCM, we have devoted our efforts to improving the integrated codes for FI and designing advanced targets together with the experimental group. Recent FI experiments [K. U. Akli et al., Phys. Rev. E 86, 065402(2012)] showed that the petawatt laser beam energy was not efficiently converted into the compressed core because of the beam divergence of relativistic electron beams. The coupling efficiency can be improved in three ways:(1) using a cone–wire-in-shell advanced target to enhance the transport efficiency,(2) using external magnetic fields to collimate fast electrons, and(3) reducing the prepulse level of the petawatt laser beam. The integrated codes for FI, named ICFI, including a radiation hydrodynamic code, a particle-in-cell(PIC) simulation code,and a hybrid fluid–PIC code, have been developed to design this advanced target at the IAPCM. The Shenguang-II upgraded laser facility has been constructed for FI research; it consists of eight beams(in total 24 kJ/3ω, 3 ns) for implosion compression, and a heating laser beam(0.5–1 kJ, 3–5 ps) for generating the relativistic electron beam. A fully integrated FI experiment is scheduled for the 2014 project.

关键词： fast ignition integrated simulation codes

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The effect of electron initial longitudinal velocity on the non-sequential double ionization process in an elliptically polarized laser field

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Chinese physics B 2012年第8期21卷 191-196页

作者：郝小雷李卫东刘杰陈京 Institute of Theoretical Physics and Department of Physics Shanxi University Center for Applied Physics and Technology Peking University Institute of Applied Physics and Computational Mathematics

The effect of initial longitudinal velocity of the tunnelled electron on the non-sequential double ionization （NSDI） process in an elliptically polarized laser field is studied by a semiclassical model. We find that the non-zero initial longitudinal velocity has a suppressing effect on single-return collision （SRC） events in the double ionization process, more specifically, it results in an obvious reduction in the center part of the correlation momentum distributions in the direction of the major polarization axis （z axis） and makes the distribution of single-return collision in the minor polarization axis （x axis） become narrower.

关键词： non-sequential double ionization initial longitudinal velocity elliptically polarized laserfield single return collision

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