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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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    Surface tension effects on Rayleigh-Taylor instability in nonideal fluids:A multiple-relaxation-time discrete Boltzmann study

    Feng ChenAiguo XuJiahui SongYanbiao Gan...
    87-105页
    查看更多>>摘要：A multi-relaxation-time discrete Boltzmann model for compressible non-ideal gases with adjustable specific heat ratio is pro-posed,and the impact of surface tension on Rayleigh-Taylor instability(RTI)is investigated from two perspectives:macroscopic and non-equilibrium characteristics.In terms of physical cognition,(1)it is found that there are two critical surface tensions:the upper critical value and the lower critical value.When the surface tension is below the lower critical value,the RTI evolution aligns qualitatively with the case without surface tension.As the surface tension coefficient increases,the inhibitory effect on RTI evolution gradually strengthens.When the surface tension is greater than the upper critical value,the disturbance interface tends to be stable after multiple oscillations.When the surface tension is in between,the perturbation interface first reverses,or even multiple reverses,and then destabilizes and develops rapidly.(2)A series of new kinetic behavior characteristics are given,and it is found that some behavior characteristics have important reference value for the control of system behavior.For example,the first peak in the growth rate of the global average non-organized momentum flux strength D2 corresponds to the onset of the regular nonlinear stage.The peak in the growth rate of the global average non-organized energy flux strength D3,1 marks the beginning of the re-acceleration stage.The onset of the uniform acceleration stage in the growth rate of the global average non-equilibrium strength DTNE corresponds to the system transitioning into the regular nonlinear stage,while its terminal point(also the peak)corresponds to the system entering the re-acceleration stage.These insights enhance understanding of RTI mechanisms in complex fluids kinetically.
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    Convergent Richtmyer-Meshkov instability on two-dimensional tri-mode interfaces

    Zhigang ZhaiJinru XuXisheng Luo
    106-118页
    查看更多>>摘要：Interfacial fluid mixing driven by a shock wave is a common phenomenon that occurs frequently in basic science research and in a variety of applications.In this work,shock-tube experiments on the developments of two-dimensional tri-mode interfaces accelerated by a convergent shock wave are performed.Eight sets of different combinations in the value of phase and that of amplitude in a tri-mode perturbed interface are studied to evaluate the effect of mode coupling on the amplitude growths of the basic modes.The qualitative results show that the phase combination obviously affects the interface morphologies and flow features.The alternation of each mode amplitude does not affect the major flow features,such as the number and arrangement of the bubbles and spikes,but affects the local interface features.Depending upon the phase combination,the mode amplitude growth is either promoted or suppressed by mode coupling relative to the single-mode counterpart.By considering the feedbacks from both the first-order and second-order mode couplings,the mode amplitude growth can be qualitatively predicted.Relative to dual-mode interface,mode coupling occurs earlier in tri-mode interface.For the sets of parameters we studied,the effect of initial phase on the amplitude growth is greater and occurs earlier for the mode with low mode number.In addition,the amplitude development of mode with high mode number is more affected by initial amplitudes of basic modes than that of mode with low mode number.The introduction of the third mode affects the amplitude growths of original two modes,but has little effect on the final mixing width growth.Finally,a theoretical model is proposed to predict the amplitude growth of each basic mode.
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    Disentangling the electron-lattice dichotomy of the excitonic insulating phase in Ta2Ni(Se1-xSx)5 with sulfur substitution and potassium deposition

    Tongrui LiYang LiuHongen ZhuHaiping Chen...
    119-126页
    查看更多>>摘要：Ta2NiSe5 is a promising candidate for hosting an excitonic insulator(EI)phase,a novel electronic state driven by electron-hole Coulomb attraction.However,the role of electron-lattice coupling in the formation of the EI phase remains controversial.Here,we use angle-resolved photoemission spectroscopy(ARPES)to study the band structure evolution of Ta2Ni(Se1-xSx)5 with sulfur substitution and potassium deposition,which modulate the band gap and the carrier concentration,respectively.We find that the Ta 5d states originating from the bottom of the conduction band persist at the top of the valence band in the low-temperature monoclinic phase,indicating the importance of exciton condensation in opening the gap in the semi-metallic band structure.We also observe that the characteristic overlap between the conduction and valence bands can be restored in the monoclinic lattice by mild carrier injection,suggesting that the lattice distortion in the monoclinic phase is not the main factor for producing the insulating gap,but rather the exciton condensation in the electronic system is the dominant driving force.Our results shed light on the electron-lattice decoupling and the origin of the EI phase in Ta2Ni(Se1-xSx)5.
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    Hinge Majorana flat band in type-Ⅱ Dirac semimetals

    Yue XieXianxin WuZhong FangZhijun Wang...
    127-132页
    查看更多>>摘要：Type-Ⅱ Dirac semimetals exhibit a unique Fermi surface topology,which allows them to host novel topological superconductivity(TSC).We reveal a novel inter-orbital superconducting state,corresponding to the B1u and B2u pairings under the D4h point group.Intriguingly,we find that both first-and second-order TSC coexist in this novel state.It is induced by a dominant inter-orbital attraction and possesses surface helical Majorana cones and hinge Majorana flat bands,spanning the entire z-directed hinge Bril-louin zone.Further investigation uncovers that these higher-order hinge modes are robust against the C4z symmetry-breaking perturbation.
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    General theory for designing phonon transport in alloyed/doped materials

    Chenhan LiuChao WuWei LiuYunshan Zhao...
    133-140页
    查看更多>>摘要：Alloying/doping is a widely used technique for improving the electrical,mechanical,and optical properties of materials.However,this technology induces significant distortions in the lattice structure,mass distribution,and potential field,greatly enhancing phonon scattering.Here,we introduce the concept of alloying/doping path and employ crystal symmetry,lattice deformation,and electron distribution to characterize it.Based on this new concept,the phonon thermal transport behavior in alloyed/doped materials can be well designed,and along different alloying/doping paths,the difference in thermal conductivity can be up to 45 times.On one hand,strategic alloying/doping that combines high crystal symmetry,large lattice contraction,and the same electron distribution suppresses phonon-phonon scattering phase space,induces phonon stiffening,and bolsters electronic structure symmetry,respectively.These synergistic effects significantly improve thermal conductivity.On the other hand,random alloying/doping has a low symmetry,leading to the typical"U"shape of alloying/doping level-dependent thermal conductivity.Our theory is corroborated in three-dimensional(3D)Si,2D MoS2,and quasi-1D TiS3,affirming its efficacy and broad applicability in controlling phonon transport.
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    Non-Hermitian polarization quantized by time-reversal symmetry

    Jing ChengJinbing HuZhigao HuLin Chen...
    141-147页
    查看更多>>摘要：It is well known that in one-dimensional(1D)crystalline insulators,the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS)as in Hermitian physics TRS does not induce any topological phase in one dimension.In this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk polarization.The underlying physical reason is unveiled:TRS guar-antees the complex energies to come in pair(E,E*),and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate,hence,giving rise to a stable wannier center.The electron transport is performed by means of charge pumping process,which verifies the physical mechanism above.At last,we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.
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    Synthesis and optical properties of high-quality ultrathin homogeneous GaAs1-xSbx nanowires

    Ran ZhuoLianjun WenJian WangXiuming Dou...
    148-156页
    查看更多>>摘要：Ternary GaAs1-xSbx nanowires with designable bandgaps and lattice constants show important potential applications in band structure engineering as well as optical and optoelectronic devices.However,large diameters,low aspect ratios and even spontaneous core-shell structures are always found in GaAs1-xSbx nanowires,which are hindering their optical and optoelec-tronic applications.Here,we report the controlled synthesis of ultrathin GaAs1-xSbx nanowires on Si(111)substrates by molecular-beam epitaxy.It is found that ultrathin GaAs1-xSbx nanowires with a diameter less than 40 nm and an aspect ratio exceeding 35 can be obtained by precisely tuning the Ga flux and the growth temperature.The growth of the ultrathin GaAs1-xSbx nanowires with a large-composition-range(0≤x≤0.4)are also achieved by directly tuning the antimony flux.Detailed structural studies confirm that these ultrathin nanowires exhibit high crystal-quality,and no spontaneous core-shell nanostructures are observed along the axial and radial directions of the nanowires.As far as we known,it is the first time that homogeneous GaAs1-xSbx nanowires are grown by molecular-beam epitaxy.Photoluminescence measurements prove that the ultrathin GaAs1-xSbx nanowires have a narrower full width at half maximum of the photoluminescence peak compared with those results reported in the literatures,and their emission wavelengths can be tuned from 850 nm(GaAs)to 1271 nm(GaAs0.6Sb0.4).In addition,the optical properties of the ultrathin GaAs1-xSbx nanowires can be further improved by using the Al0.5Ga0.5As shell as a passivation layer.Our work lays a foundation for the development of high-performance GaAs1-xSbx nanowire-based optical and optoelectronic devices.
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    Re-emergence of superconductivity via pressure-induced Lifshitz transition in preserved 6R-TaS2 crystal structure

    Xindeng LvHao SongKun ChenSirui Liu...
    157-165页
    查看更多>>摘要：Investigating the implications of interlayer coupling on superconductivity is vital for comprehending the intrinsic mechanisms of two-dimensional materials.Van der Waals heterojunctions have attracted extensive research owing to their exotic interlayer cou-pling.In this study,we investigated the natural heterostructure superconductor featuring 6R-TaS2 via measurements of electrical resistance,the Hall effect,and in-situ synchrotron X-ray diffraction(XRD)under various pressures.The study findings show that the superconducting transition temperature(Tc)of 6R-TaS2 in the range of 0-32.5 GPa exhibits an unusual double-dome behavior as a function of pressure,with the first and second domes in the pressure range of 0-5.3 and 6.8-32.5 GPa,respectively.At 56.6 GPa,a new superconducting phase with a Tc of 2 K was observed.The XRD results show that the singular evolution of the Tc is independent of the structural phase transition.Combining the XRD results,first-principles calculations,and Hall effect mea-surements,we found that different interlayer coupling effects resulted in double dome superconductivity and the re-emergence of superconducting.Our findings shed light on the pivotal role of interlayer coupling in driving the anomalous alterations in superconducting properties triggered by charge transfer and Fermi surface reconstruction and provide an alternative route for comprehending the mechanisms of superconductivity in transition metal dichalcogenides(TMDs).
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    Gravitational wave search by time-scale-recursive denoising and matched filtering

    Cunliang MaChenyang MaZhoujian CaoMingzhen Jia...
    166-182页
    查看更多>>摘要：In our previous work[Physical Review D,2024,109(4):043009],we introduced MSNRnet,a framework integrating deep learn-ing and matched filtering methods for gravitational wave(GW)detection.Compared with end-to-end classification methods,MSNRnet is physically interpretable.Multiple denoising models and astrophysical discrimination models corresponding to dif-ferent parameter space were operated independently for the template prediction and selection.But the MSNRnet has a lot of computational redundancy.In this study,we propose a new framework for template prediction,which significantly improves our previous method.The new framework consists of the recursive application of denoising models and waveform classification models,which solve the problem of computational redundancy.The waveform classification network categorizes the denoised output based on the signal's time scale.To enhance the denoising performance for long-time-scale data,we upgrade the denois-ing model by incorporating Transformer and ResNet modules.Furthermore,we introduce a novel training approach that allows for the simultaneous training of the denoising network and waveform classification network,eliminating the need for manual annotation of the waveform dataset required in our previous method.Real-data analysis results demonstrate that our new method decreases the false alarm rate by approximately 25％,boosts the detection rate by roughly 5％,and slashes the computational cost by around 90％.The new method holds potential for future application in online GW data processing.
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    The transition from galaxy-wide gas inflow to outflow in quasar host galaxies

    Zhicheng HeZhifu ChenGuilin LiuTinggui Wang...
    183-196页
    查看更多>>摘要：Galactic-scale outflows driven by active galactic nuclei(AGNs)represent a commonly invoked feedback mechanism within galaxy evolution models.However,the interactions among interstellar gas on galactic scales,the propagation of AGN outflows,and the fundamental parameters of AGNs during their evolutionary processes remain poorly understood.Notably,powerful nu-clear outflows are typically associated with the early stages of AGN activity,which are characterized by high accretion rates and weak narrow emission lines.In our analysis of a sample of quasars hosting Mgn narrow absorption lines(NALs)obtained from the Sloan Digital Sky Survey,we identify a previously unobserved phenomenon wherein galaxy-scale inflow transitions to outflow dominance,concurrent with a notable increase in the strength of the narrow[O Ⅲ]line,achieving a confidence level of 6.7σ.This indicates that while nuclear outflows diminish,galaxy-wide outflows intensify as AGNs evolve.These findings suggest that early-stage outflows interact with the interstellar medium on a galactic scale,thereby facilitating a gradual transition to galaxy-wide outflows.This provides observational support for the hypothetical multi-stage propagation of AGN outflows that globally regulates galaxy evolution.
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