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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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    Superexchange and charge transfer in the nickelate superconductor La3Ni2O7 under pressure

    Wéi WúZhihui LuoDao-Xin YaoMeng Wang...
    1-8页
    查看更多>>摘要：Recently,a bulk nickelate superconductor La3Ni2O7 is discovered at pressures with a remarkable high transition temperature Tc～80 K.Here,we study a Hubbard model with tight-binding parameters derived from ab initio calculations of La3Ni2O7,by employing large scale determinant quantum Monte Carlo and cellular dynamical mean-field theory.Our result suggests that the superexchange couplings in this system are comparable to that of cuprates.The system is a charge transfer insulator as the hole concentration becomes four per site at large Hubbard U.Upon hole doping,two low-energy spin-singlet bands emerge in the system exhibiting distinct correlation properties:while the one composed of the out-of-plane Ni-d3z2-r2 and O-pz orbitals demonstrates strong antiferromagnetic correlations and narrow effective bandwidth,the in-plane singlet band consisting of the Ni-dx2-y2 and O-px/py orbitals is in general more itinerant.Over a broad range of hole doping,the doped holes occupy primarily the dx2-y2 and px/py orbitals,whereas the d3z2-r2 and pz orbitals retain underdoped.We propose an effective t-J model to capture the relevant physics and discuss the implications of our result for comprehending the La3Ni2O7 superconductivity.
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    Structural transition,electric transport,and electronic structures in the compressed trilayer nickelate La4Ni3O10

    Jingyuan LiCui-Qun ChenChaoxin HuangYifeng Han...
    9-15页
    查看更多>>摘要：Atomic structure and electronic band structure are fundamental properties for understanding the mechanism of super-conductivity.Motivated by the discovery of pressure-induced high-temperature superconductivity at 80 K in the bilayer Rud-dlesden-Popper nickelate La3Ni2O7,the atomic structure and electronic band structure of the trilayer nickelate La4Ni3O10 under pressure up to 44.3 GPa are investigated.A structural transition from the monoclinic P21/a space group to the tetragonal 14/mmm around 12.6-13.4 GPa is identified,accompanied by a drop of resistance below 7 K.Density functional theory calculations suggest that the bonding state of Ni 3dz 2 orbital rises and crosses the Fermi level at high pressures,which may give rise to possible superconductivity observed in resistance under pressure in La4Ni3O10.The trilayer nickelate La4Ni3O10 shows some similarities with the bilayer La3Ni2O7 and has unique properties,providing a new platform to investigate the underlying mechanism of superconductivity in nickelates.
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    Gravitational wave fluxes on generic orbits in near-extreme Kerr spacetime:Higher spin and large eccentricity

    Changkai ChenJiliang Jing
    16-28页
    查看更多>>摘要：To accurately obtain the waveform template of gravitational waves,substantial computational resources and extremely high pre-cision are often required.In a previous study,we employed the confluent Heun function to obtain an exact solution to the Teukolsky equation.This approach allowed us to efficiently and accurately calculate the gravitational wave flux for a particle in circular orbits around a Schwarzschild black hole.Building on this method,we now extend its application to calculate the asymptotic gravitational wave fluxes from a particle in generic orbits around a near-extreme Kerr black hole.Our extended method proves particularly effective in handling computational challenges associated with large eccentricities(e=0.9),higher spins(a=0.999),higher harmonic modes,and strong-field regions.The results we obtained significantly outperform those derived from the numerical integration method based on the Mano-Suzuki-Takasugi method.
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    Holographic superfluid ring with a weak link

    Zhi-Hong LiHuai-Fan Li
    29-38页
    查看更多>>摘要：We explore the generation of topological defects in the course of a dynamical phase transition in a ring with a weak link,i.e.,a SSS Josephson junction,from the AdS/CFT correspondence.By setting different parameters of the junction(width,steepness,depth)and the final temperature of the quench,the configurations of the charge density and condensate of the order parameters of the dual field theory are presented.Meanwhile,we observe that in the final equilibrium state,variations in parameters of the junctions only affect the configurations of the charge density and condensate of the order parameters,without altering their values outside the junction.However,variations in the final temperature will directly affect the values of the charge density and con-densate of the order parameters outside of the junction.Moreover,in the final equilibrium state,we propose an analytic relation between the gauge-invariant velocity in the two superconducting states in the SSS Josephson junction,which agrees well with the numerical results.
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    Domain wall network:A dual solution for gravitational waves and Hubble tension?

    Ligong BianShuailiang GeChanghong LiJing Shu...
    39-46页
    查看更多>>摘要：We explore the possibility that domain wall networks generate the stochastic gravitational wave background(SGWB)observed as a strong common power-law process in the Data Release-2 of Parkes Pulsar Timing Array.We find that a broad range of param-eters,specifically wall tension around σDW～(29-414 TeV)3 and wall-decay temperature within Td～20-257 MeV,can explain this phenomenon at a 68％credible level.Meanwhile,the same parameters could ease the Hubble tension if particles from these domain wall networks decay into dark radiation.We establish a direct analytical relationship,ΩGW(fp,T0)h2～Ωradh2(ΩvΔNeff)2,to illustrate this coincidence,underlining its importance in the underlying physics and potential applicability to a wider range of models and data.Conversely,if the common power-law process is not attributed to domain wall networks,our findings impose tight limits on the wall tension and decay temperature.
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    Exploring multiple phases and first-order phase transitions in Kármán Vortex Street

    Xu LiXing XiangTingting XueLimin Wang...
    47-54页
    查看更多>>摘要：Kármán Vortex Street,a fascinating phenomenon of fluid dynamics,has intrigued the scientific community for a long time.Many researchers have dedicated their efforts to unraveling the essence of this intriguing flow pattern.Here,we apply the lattice Boltz-mann method with curved boundary conditions to simulate flows around a circular cylinder and study the emergence of Kármán Vortex Street using the eigen microstate approach,which can identify phase transition and its order-parameter.At low Reynolds number,there is only one dominant eigen microstate W1 of laminar flow.At Re1c=53.6,there is a phase transition with the emergence of an eigen microstate pair W2,3 of pressure and velocity fields.Further at Re2c=56,there is another phase transition with the emergence of two eigen microstate pairs W4,5 and W6,7.Using the renormalization group theory of eigen microstate,both phase transitions are determined to be first-order.The two-dimensional energy spectrum of eigen microstate for W1,W2,3 after Rec 1,W4-7 after Re2 exhibit-5/3 power-law behavior of Kolnogorov's K41 theory.These results reveal the complexity and provide an analysis of the Kármán Vortex Street from the perspective of phase transitions.
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    Footprints of axion-like particle in pulsar timing array data and James Webb Space Telescope observations

    Shu-Yuan GuoMaxim KhlopovXuewen LiuLei Wu...
    55-62页
    查看更多>>摘要：Several pulsar timing array(PTA)collaborations have recently reported the evidence for a stochastic gravitational-wave back-ground(SGWB),which can unveil the formation of primordial seeds of inhomogeneities in the early universe.With the SGWB parameters inferred from PTAs data,we can make a prediction of the seeds for early galaxy formation from the domain walls in the axion-like particles(ALPs)field distribution.This also naturally provides a solution to the observation of high redshifts by the James Webb Space Telescope.The predicted photon coupling of the ALP is within the reach of future experimental searches.
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    The radiative decay of scalar glueball from lattice QCD

    Jintao ZouLong-Cheng GuiYing ChenWen Qin...
    63-74页
    查看更多>>摘要：We perform the first lattice QCD study on the radiative decay of the scalar glueball to the vector meson φ in the quenched ap-proximation.The calculations are carried out on three gauge ensembles with different lattice spacings,which enable us to do the continuum extrapolation.We first revisit the radiative J/Ψ decay into the scalar glueball G and obtain the partial decay widthΓ(J/Ψ→ γG)=0.578(86)keV and the branching fraction Br(J/Ψ → yG)=6.2(9)x 10-3,which are in agreement with the previous lattice results.We then extend the similar calculation to the process G → γφ and get the partial decay widthΓ(G → γφ)=0.074(47)keV,which implies that the combined branching fraction of J/Ψ → yG → γγφ is as small as O(10-9)such that this process is hardly detected by the BESIII experiment even with the large J/Ψ sample of O(1010).With the vector meson dominance model,the two-photon decay width of the scalar glueball is estimated to be Γ(G → γγ)=0.53(46)eV,which results in a large stickiness S(G)～O(104)of the scalar glueball by assuming the stickiness off2(1270)to be one.
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    Detector performance of the Gamma-ray Transient Monitor onboard DRO-A satellite

    Pei-Yi FengZheng-Hua AnDa-Li ZhangChen-Wei Wang...
    75-90页
    查看更多>>摘要：The Gamma-ray Transient Monitor(GTM)is an all-sky monitor onboard the Distant Retrograde Orbit-A(DRO-A)satellite with the scientific objective of detecting gamma-ray transients ranging from 20 keV to 1 MeV.The GTM was equipped with five Gamma-ray Transient Probe(GTP)detector modules utilizing a NaI(Tl)scintillator coupled with a SiPM array.To reduce the SiPM noise,GTP uses a dedicated dual-channel coincident readout design.In this work,we first studied the impact of dif-ferent coincidence times on the detection efficiency and ultimately selected a 0.5 μs time coincidence window for offline data processing.To test the performance of the GTPs and validate the Monte-Carlo-simulated energy response,we conducted compre-hensive ground calibration tests using the Hard X-ray Calibration Facility(HXCF)and radioactive sources,including the energy response,detection efficiency,spatial response,bias-voltage response,and temperature dependence.We extensively present the ground calibration results and validate the design and mass model of the GTP detector,thus providing the foundation for in-flight observations and scientific data analysis.
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    Magnetic properties of soft magnetic composites prepared by gas-atomized glassy powders from a new Fe-based alloy with high glass-forming ability

    Ranbin WangJili JiaYou WuWenhui Guo...
    91-104页
    查看更多>>摘要：With a pressing need for high efficiency,low power consumption,and miniaturization of electronics,soft magnetic composites(SMCs)show great potential,especially for applications in key electronic component.However,core loss is still the focused issue for SMCs that hinders their sustainable development and widespread applications.In the present study,high-performance SMCs were fabricated by novel Fe74B7C7P7Si3Mo1Cr1 powders with spherical shape and a fully glassy structure,which were successfully prepared by a gas atomization method.The microstructure and high-frequency magnetic properties of these SMCs were studied in detail.To enhance the soft ferromagnetism,the effects of annealing temperature(Ta)and powder size on their performance were clarified.Increasing Ta up to 703 K not only helps to effectively release internal stress in the powders,but also improves the integrity of the insulation layer structure,which is conducive to decreasing the core loss.In addition,reducing the powder size contributes to the overall performance enhancement.Prepared from the powders with the smallest mean particle size and annealed at 703 K,the SMC exhibits optimum property combination of a stable effective permeability of 26.2 up to 1 MHz,a total core loss of 883 kW m-3(100 kHz,100 mT),and a DC-Bias performance of 79.3％under 100 Oe field,which is even comparable to those of the most prominent SMCs reported so far.These results are meaningful for potentially stimulating the development and application of new low-loss SMCs.
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