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中国科学:物理学 力学 天文学（英文版）
中国科学:物理学 力学 天文学（英文版）

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中国科学:物理学 力学 天文学（英文版）/Journal Science China(Physics, Mechanics&Astronomy)CSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Bayesian inference of neutron-skin thickness and neutron-star observables based on effective nuclear interactions

    Jia ZhouJun Xu
    97-105页
    查看更多>>摘要：We have obtained the constraints on the density dependence of the symmetry energy from neutron-skin thickness data by parity-violating electron scatterings and neutron-star observables using a Bayesian approach,based on the standard Skyrme-Hartree-Fock(SHF)model and its extension as well as the relativistic mean-field(RMF)model.While the neutron-skin thickness data(neutron-star observables)mostly constrain the symmetry energy at subsaturation(suprasaturation)densities,they may more or less constrain the behavior of the symmetry energy at suprasaturation(subsaturation)densities,depending on the energy-density functional form.Besides showing the final posterior density dependence of the symmetry energy,we also compare the slope parameters of the symmetry energy at 0.10 fm-3 as well as the values of the symmetry energy at twice saturation density from three effective nuclear interactions.The present work serves as a comparison study based on relativistic and non-relativistic energy-density functionals,for constraining the nuclear symmetry energy from low to high densities using a Bayesian approach.
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    • 维普

    Sodium metals for single emitter strong coupling:Alternative plasmonic candidates beyond noble metals

    Yi ZhangShuying ChenYuning HanXiulai Xu...
    106-117页
    查看更多>>摘要：This work provides a theoretical investigation into the strong coupling between a single quantum emitter(QE)and the surface plasmons of sodium metals in two representative plasmonic systems,i.e.,the semi-infinite metal-dielectric interface and the metal nanoparticles(NPs)of monomer/dimer configuration.In both configurations,sodium metals exhibit distinctly stronger coupling strength and lower optical loss in the optical region than their noble metal counterparts,demonstrating the ideal candidate characteristics for single-molecule-level strong couplings with distinctly facile operation conditions.Our results provide new insights into extreme light-matter interactions with potential applications in quantum information,optical sensors,quantum chemistry,etc.
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    • 维普

    Fermi level tuning in Sn1-xPbxTe/Pb heterostructure via changing interface roughness

    Tengteng LiuZhaoxia YiBangjin XieWeiyan Zheng...
    118-125页
    查看更多>>摘要：Superconducting SnTe-type topological crystalline insulators(TCIs)are predicted to host multiple Majorana zero modes(MZMs)which can coexist in a single vortex.Fermi level(FL)close to the Dirac points of topological surface states is helpful for detecting MZMs.However,the TCI SnTe is a heavily p-type semiconductor which is very difficult to modify to n-type via doping or alloying.In this work,we fabricate the atomically flat Sn1-xPbxTe/Pb heterostructure by molecular beam epitaxy,and make the p-type Sn1-xPbxTe become n-type through changing the interface roughness.Using scanning tunnelling microscope,we find the Dirac points of Sn1-xPbxTe/Pb heterostructure are always above the FL due to the Fermi level pinning(FLP)induced by topological surface states at atomically flat interface.After increasing the interface roughness,the FLP effect is suppressed and then the Dirac points of p-type Sn1.xPbxTe can be tuned very close to or even below the FL.Our work provides a new method for tuning the FL of SnTe-type TCI which has potential application in novel topological superconductor device.
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    Supertetragonal BaZrS3:A promising perovskite sulphide with giant ferroelectricity and low band gap

    Menglu LiSa ZhangChenhan LiuXiaotao Zu...
    126-133页
    查看更多>>摘要：Over the past century,ferroelectricity has offered exciting opportunities for fundamental research and device applications.However,most of the discovered excellent ferroelectrics are oxide materials with large band gaps,limiting their potential for optoelectronics applications.Here using first-principles calculations we identify a new narrow-gap ferroelectric beyond oxides,i.e.,ferroelectric perovskite sulphide BaZrS3.Under large compressive strains,BaZrS3 can be stabilized into a unique super-tetragonal phase with an extraordinary polarization of 67.16 μC/cm2,which is even stronger than that of conventional oxide ferroelectrics.Excitingly,the supertetragonal BaZrS3 exhibits a direct narrow band gap of l.2 eV and excellent electronic properties.Based on the chemical bonding analysis,we attribute the formation of supertetragonal phase to charge re-ordering in which the π bond overlap along the long<Zr-S>bond completely vanishes and the antibonding states of the σ bond appear below the Fermi level.Our work provides a conceptual strategy for designing new ferroelectrics for electronic and photovoltaic applications.
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    Spin-orbit interaction induced Casimir-Lifshitz torque between two-dimensional electron gases

    Jia-Nan RongLiang ChenKai Chang
    134-142页
    查看更多>>摘要：We investigate theoretically the Casimir interaction between two parallel two-dimensional electron gases(2DEGs)with Rashba and Dresselhaus spin-orbit interactions(SOIs),based on the quantum field theory.We derive an analytical expression for the polarization tensor and obtain the solution to the motion equation of the electromagnetic(EM)field.We calculate the Casimir-Lifshitz torque(CLT)between two parallel 2DEGs with Rashba and Dresselhaus SOIs,which can be tuned by changing the relative strength between two SOIs.The anisotropic Casimir energy between 2DEGs caused by the interplay between the SOIs of 2DEGs offers a new origin of CLT and a new type of optoelectronic device.
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    Unusual photocarrier and coherent phonon dynamics behaviors of layered PdSe2 unveiled by ultrafast spectroscopy of the edge surface

    Tiantian YunChangfu HuoJinluo ChengZhi-Bo Liu...
    143-152页
    查看更多>>摘要：Layered materials exhibit different electronic and phonon properties along in-plane and out-of-plane directions;existing studies focus on their in-plane behaviors,and the influence of such anisotropies on the dynamics of photocarriers and phonons is unknown.Here,we fabricate layered PdSe2 crystals with flat edge surfaces and compare the time-resolved ultrafast spectro-scopies on their basal and edge surfaces.Pronounced differences in the transient reflection spectroscopies reveal the inconsistent photocarrier and phonon dynamics behaviors on the two surfaces:the slow hot carrier relaxation process is accelerated and the thermoelasticity-induced longitudinal coherent acoustic phonon oscillation completely vanishes on the edge surface,as com-pared with the basal surface.Theoretical analysis reveals that the inconsistent hot carrier dynamics originate from the anisotropic properties of low-energy phonons in PdSe2,and the absence of phonon oscillation on the edge surface results from the wavevector-limited sensitivity of acoustic B1u mode.Moreover,polarization-dependent spectroscopies indicate the diverse optical anisotropies béyond the in-plane of PdSe2.This work provides a new method to explore unique physical properties and modulate the optical anisotropy of layered materials.
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    Purity-dependent Lorenz number,electron hydrodynamics and electron-phonon coupling in WTe2

    Wei XieFeng YangLiangcai XuXiaokang Li...
    153-158页
    查看更多>>摘要：We present a study of electrical and thermal transport in Weyl semimetal WTe2 down to 0.3 K.The Wiedemann-Franz law holds below 2 K and a downward deviation starts above.The deviation is more pronounced in cleaner samples,as expected in the hy-drodynamic picture of electronic transport,where a fraction of electron-electron collisions conserve momentum.Phonons are the dominant heat carriers and their mean-free-path does not display a Knudsen minimum.This is presumably a consequence of weak anharmonicity,as indicated by the temperature dependence of the specific heat.Frequent momentum exchange between phonons and electrons leads to quantum oscillations of the phononic thermal conductivity.Bloch-Grüneisen picture of electron-phonon scattering breaks down at low temperature when Umklapp ph-ph collisions cease to be a sink for electronic flow of momentum.Comparison with semi-metallic Sb shows that normal ph-ph collisions are amplified by anharmonicity.In both semimetals,at cryogenic temperature,e-ph collisions degrade the phononic flow of energy but not the electronic flow of momentum.
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    Exploring charge and spin fluctuations in infinite-layer cuprate SrCuO2 from a phonon perspective

    Xin DuPei-Han SunBen-Chao GongJian-Feng Zhang...
    159-167页
    查看更多>>摘要：The infinite-layer cuprate ACuO2(A=Ca,Sr,Ba)possesses the simplest crystal structure among numerous cuprate supercon-ductors and can serve as a prototypical system to explore the unconventional superconductivity.Based on the first-principles electronic structure calculations,we have studied the electronic and magnetic properties of the infinite-layer cuprate SrCu02 from a phonon perspective.We find that interesting fluctuations of charges,electrical dipoles,and local magnetic moments can be induced by the atomic displacements of phonon modes in SrCuO2 upon the hole doping.Among all optical phonon modes of SrCuO2 in the antiferromagnetic Néel state,only the A1g mode that involves the full-breathing O vibrations along the Cu-0 bonds can cause significant fluctuations of local magnetic moments on O atoms and dramatic charge redistributions between Cu and O atoms.Notably,due to the atomic displacements of the A1g mode,both the charge fluctuations on Cu and the electrical dipoles on 0 show a dome-like evolution with increasing hole doping,quite similar to the experimentally observed behavior of the superconducting Tc;in comparison,the fluctuations of local magnetic moments on O display a monotonic enhancement along with the hole doping.Further analyses indicate that around the optimal doping,there exists a large softening in the frequency of the A1g phonon mode and a van Hove singularity in the electronic structure close to the Fermi level,suggesting potential electron-phonon coupling.Our work reveals the important role of the full-breathing O phonon mode playing in the infinite-layer SrCuO2,which may provide new insights in understanding the cuprate superconductivity.
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    Frustrated superconductivity and sextetting order

    Zhiming PanChen LuFan YangCongjun Wu...
    168-176页
    查看更多>>摘要：The superconducting state typically favors a uniform spatial distribution akin to ferromagnetism.Nevertheless,the pair-density-wave state exhibits sign changes in the pairing order,leading to potential frustrations in phase coherence.We propose a mech-anism to the sextetting order stemming from the frustrations in the phase coherence of a pair-density-wave state,whose spatial modulation manifests a vortex-antivortex honeycomb lattice.The classical ground state configurations are mapped to Baxter's three-coloring model,revealing a macroscopic degeneracy accompanied by extensive entropy.The phase coherence problem intertwines the U(1)phases and the vorticity variables.While the resultant color and phase fluctuations suppress the pair-density-wave order,they maintain the sextetting order above the superconducting transition temperature(Tc).The 1/3-fractional vortex emerges as the fundamental topological defect in the sextetting order.This novel mechanism of frustrated superconductivity provides an alternative explanation for the experimental observed fractional oscillations in CsV3Sb5.
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    Pressure-triggered stacking dependence of interlayer coupling in bilayer WS2

    Zejuan ZhangChenyin JiaoShenghai PeiXilong Zhou...
    177-186页
    查看更多>>摘要：Tungsten disulfide(WS2)has been reported to show negligible stacking dependence under ambient conditions,impeding its further explorations on physical properties and potential applications.Here,we realize efficient modulation of interlayer coupling in bilayer WS2 with 3R and 2H stackings by high pressure,and find that the pressure-triggered interlayer coupling and pressure-induced resonant-to-nonresonant transition exhibit prominent stacking dependence,which are experimentally observed for the first time in WS2.Our work may unleash the stacking degree of freedom in designing WS2 devices with tailored properties correlated to interlayer coupling.
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