Science China Physics, Mechanics & Astronomy最新文献_第6页

Retarded stellar dynamo in tidally deformed M dwarfs 在潮汐变形的M矮星中迟钝的恒星发电机

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-16 DOI: 10.1007/s11433-025-2941-9

Song Wang, Wenbo Li, Henggeng Han, Dali Kong, Jifeng Liu, Xinlin Zhao

{"title":"Retarded stellar dynamo in tidally deformed M dwarfs","authors":"Song Wang, Wenbo Li, Henggeng Han, Dali Kong, Jifeng Liu, Xinlin Zhao","doi":"10.1007/s11433-025-2941-9","DOIUrl":"10.1007/s11433-025-2941-9","url":null,"abstract":"<div>Current studies of stellar dynamos primarily focus on spherical stars, leaving their behavior in distorted stars largely unexplored. We utilize stars of varying distortions to examine the relation between stellar cycle periods (Pcyc) and rotation periods (Prot), which are closely linked to dynamo processes. By analyzing a sample of tidally distorted M dwarfs in cataclysmic variables, we identify an anti-correlation between Pcyc and Prot, in contrast to the lack of such a relation in single M dwarfs. This means that stars with greater deformation have longer cycle periods, suggesting variations in dynamo behavior under non-spherical geometries. Our numerical simulations further reveal that the thermal convection weakens in highly distorted stars, and subsequently, the differential rotation is also reduced. These effects may lengthen the conversion timescale between poloidal and toroidal magnetic fields, potentially explaining the newly discovered Pcyc-Prot relation in cataclysmic variables.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 8","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterisation of high-dimensional frequency-orbital angular momentum entangled states 高维频率-轨道角动量纠缠态的制备与表征

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-13 DOI: 10.1007/s11433-025-2908-0

Zhao-Qi-Zhi Han, Xiao-Hua Wang, Zhi-Yuan Zhou, Shi-Yao Fu, He Zhang, Zheng-He Zhou, Bo-Wen Liu, Ren-Hui Chen, Yue-Wei Song, Zhi-Cheng Guo, Jin-Peng Li, Yin-Hai Li, Bao-Sen Shi

引用次数: 0

Strength of Kitaev interaction in Na3Co2SbO6 and Na3Ni2BiO6 Na3Co2SbO6和Na3Ni2BiO6中Kitaev相互作用的强度

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-12 DOI: 10.1007/s11433-025-2743-4

Zefeng Chen, Binhua Zhang, Weiqin Zhu, Lianchuang Li, Boyu Liu, Junsheng Feng, Changsong Xu, Hongjun Xiang

{"title":"Strength of Kitaev interaction in Na3Co2SbO6 and Na3Ni2BiO6","authors":"Zefeng Chen, Binhua Zhang, Weiqin Zhu, Lianchuang Li, Boyu Liu, Junsheng Feng, Changsong Xu, Hongjun Xiang","doi":"10.1007/s11433-025-2743-4","DOIUrl":"10.1007/s11433-025-2743-4","url":null,"abstract":"<div>The Kitaev spin liquid is proposed to be a promising realization in low spin-orbit coupling 3d systems, represented by Na3Co2SbO6 and Na3Ni2BiO6. However, the existence of Kitaev interaction is still debatable in experiments, and obtaining the strength of Kitaev interaction from first-principles calculations is also challenging. Here, we report the state-dependent anisotropy of Kitaev interaction, based on which a convenient method is developed to rapidly determine the strength of Kitaev interaction. Applying such a method and density functional theory calculations, it is found that Na3Co2SbO6 with 3d7 configuration exhibits considerable ferromagnetic Kitaev interaction. Moreover, by further applying the symmetry-adapted cluster expansion method, a realistic spin model is determined for Na3Ni2BiO6 with 3d8 configuration. Such a model indicates a negligibly small Kitaev interaction, but it predicts many properties, such as ground states and field effects, which are consistent with measurements. Furthermore, we demonstrate that the heavy elements, Sb or Bi, located at the hollow sites of the honeycomb lattice, do not contribute to the emergence of Kitaev interaction through proximity, contrary to common belief. The presently developed anisotropy mapping method will be beneficial not only for computations but also for measurements.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 5","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Does the radio-active phase of XTE J1810–197 recur following the same evolutionary pattern? XTE J1810-197的放射性阶段是否按照相同的进化模式复发？

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-11 DOI: 10.1007/s11433-025-2902-8

Zhipeng Huang, Zhen Yan, Zhiqiang Shen, Hao Tong, Mingyu Ge, Zhifu Gao, Yajun Wu, Rongbing Zhao, Jie Liu, Rui Wang, Xiaowei Wang, Fan Yang, Chuyuan Zhang, Zhenlong Liao, Yangyang Lin

{"title":"Does the radio-active phase of XTE J1810–197 recur following the same evolutionary pattern?","authors":"Zhipeng Huang, Zhen Yan, Zhiqiang Shen, Hao Tong, Mingyu Ge, Zhifu Gao, Yajun Wu, Rongbing Zhao, Jie Liu, Rui Wang, Xiaowei Wang, Fan Yang, Chuyuan Zhang, Zhenlong Liao, Yangyang Lin","doi":"10.1007/s11433-025-2902-8","DOIUrl":"10.1007/s11433-025-2902-8","url":null,"abstract":"<div>Magnetars are the most strongly magnetized compact objects known in the Universe and are regarded as one of the primary engines powering a variety of enigmatic, high-energy transients. However, our understanding of magnetars remains highly limited, constrained by observational sample size and radiative variability. XTE J1810–197, which re-entered a radio-active phase in 2018, is one of only six known radio-pulsating magnetars. Leveraging the distinctive capability for simultaneous dual-frequency observations, we utilized the Shanghai Tianma Radio Telescope (TMRT) to monitor this magnetar continuously at both 2.25 and 8.60 GHz, capturing its entire evolution from radio activation to quenching. This enabled precise characterization of the evolution in its integrated profile, spin frequency, flux density, and spectral index (α, defined by S ∝ fα). The first time derivative of its spin frequency (dot v) passed through four distinct phases—rapid decrease, violent oscillation, steady decline, and stable recovery—before returning to its pre-outburst value concomitant with the cessation of radio emission. Remarkably, both the amplitudes and the characteristic time-scales of these (dot v) variations match those observed during the previous outburst that began in 2003, providing the first demonstration that post-outburst rotational evolution and radiative behavior in a magnetar are repeatable. A twisted-magnetosphere model can qualitatively account for this repeatability as well as for the progressive narrowing and abrupt disappearance of the radio pulse radiation, thereby receiving strong observational support.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 5","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147558886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Revisiting the initial-amplitude effect on Richtmyer-Meshkov instability 重新审视richhtmyer - meshkov不稳定性的初始振幅效应

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-09 DOI: 10.1007/s11433-025-2920-1

He Wang, Xisheng Luo

{"title":"Revisiting the initial-amplitude effect on Richtmyer-Meshkov instability","authors":"He Wang, Xisheng Luo","doi":"10.1007/s11433-025-2920-1","DOIUrl":"10.1007/s11433-025-2920-1","url":null,"abstract":"<div>The effect of initial perturbation amplitude has been a focus of research on Richtmyer-Meshkov instability (RMI) for decades. Three principal mechanisms have been advanced as potential explanations: interface geometry, secondary compression, and shock proximity. Nevertheless, disparate interpretations across prior studies have left the dominant mechanisms unresolved. Here, we revisit this long-standing issue through a carefully designed and systematic experimental campaign, providing, to our knowledge, the first direct mechanistic delineation. We demonstrate that secondary compression exerts no influence on linear evolution, whereas interface geometry and shock proximity play differing roles. Moreover, a previously unrecognised mechanism, termed vorticity deposition, is identified. Reduction factors quantifying the interface-geometric mechanism are validated under conditions satisfying their underlying assumption. We further find that the shock-proximity and vorticity-deposition mechanisms are strongly sensitive to shock intensity for Mach numbers below 1.5, but exhibit only weak sensitivity at higher values. Moreover, we reveal that the non-monotonic dependence of growth rate on initial amplitude arises from the coupled action of interface-geometric, shock-proximity, and vorticity-deposition mechanisms, rather than from interface geometry alone. This revisitation resolves a long-standing ambiguity and yields new insight into RMI dynamics.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 6","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inter-species topological phases via a dynamical gauge field 通过动态规范场的种间拓扑相

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-09 DOI: 10.1007/s11433-025-2882-5

Zhoutao Lei, Linhu Li

{"title":"Inter-species topological phases via a dynamical gauge field","authors":"Zhoutao Lei, Linhu Li","doi":"10.1007/s11433-025-2882-5","DOIUrl":"10.1007/s11433-025-2882-5","url":null,"abstract":"<div>We uncover a class of inter-species topological phases in a one-dimensional lattice, loaded with two species of non-identical particles interacting via a dynamical gauge field (DGF). Two types of topological states are found to emerge from different inter-species topology activated by the DGF. Specifically, edge confined states with co-localization of both species arise from an extrinsic inter-species topology, which can be decomposed into the single-particle topology for each species. On the other hand, bulk-bound states with extended distribution emerge from an intrinsic inter-species topology that cannot be understood from single-particle ones. The two classes of inter-species topology are found to be independent of each other, characterized by different sets of inter-species topological invariants. Thus, their topological states can coexist in certain parameter regimes and compete with each other, leading to distinguished dynamical signatures. We further propose a feasible cold-atom realization of our model to demonstrate experimental accessibility of inter-species topological phases. Our work establishes inter-species topology as a new organizing principle of topological matter, revealing how correlations between distinct particle species can generate topological phenomena beyond single-particle paradigms.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 5","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147440765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Echoes from the Minkowski-core spacetime 闵可夫斯基核时空的回声

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-06 DOI: 10.1007/s11433-025-2904-2

Dan Zhang, Qin Tan, Guoyang Fu, Huajie Gong, Jian-Pin Wu, Qiyuan Pan

引用次数: 0

Optical diagnostics of flow velocity in pressure-matched near-vacuum gaseous micro jets 压力匹配近真空气体微射流流速的光学诊断

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-05 DOI: 10.1007/s11433-025-2880-3

Zihao Song, Yuki Wakata, Chaoben Zhao, Quan Zhou, Chao Sun, Xing Chao

{"title":"Optical diagnostics of flow velocity in pressure-matched near-vacuum gaseous micro jets","authors":"Zihao Song, Yuki Wakata, Chaoben Zhao, Quan Zhou, Chao Sun, Xing Chao","doi":"10.1007/s11433-025-2880-3","DOIUrl":"10.1007/s11433-025-2880-3","url":null,"abstract":"<div>Near-vacuum gas flow is commonly encountered in vacuum equipment and high-end manufacturing processes such as extreme ultraviolet (EUV) light sources. Understanding and controlling the characteristics of the near-vacuum flow is crucial to optimizing the performance of these applications. In this study, we investigate the flow field of gas jets in low-pressure environments under varying gas compositions, flow rates, and vacuum chamber pressures using infrared molecular tagging velocimetry (IR MTV). This method eliminates the need to introduce tracer particles into the gas flow, thereby avoiding potential systematic errors in velocity measurements caused by reduced particle followability in low-pressure conditions. High spatially-resolved (29.4 µm) velocity measurements were performed in the downstream region, 0.44D away from the nozzle (D is the diameter of the nozzle), with pressure controlled between 0.03 and 1 atm. The results show that the radial distribution of the jet velocity is independent of gas composition and flow rate and exhibits excellent similarity under the same pressure, while the maximum centerline velocity of the jet is proportional to the total gas flow rate. As the pressure decreases from 1 to 0.03 atm, the op-hat structure of the jet flow field gradually disappears, and the radial attenuation of axial velocity intensifies. In addition, the pressure reduction causes the jet centerline velocity to exceed its average exit velocity. These findings demonstrate that tracer-particle-free infrared molecular tagging velocimetry is a suitable technique for near-vacuum gas flow measurements with pressure less than 0.05 atm, providing high spatial resolution and accurate velocity distributions for both fundamental research and practical applications.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 5","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147440831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiplexing-enhanced device-independent quantum key distribution 多路增强型与设备无关的量子密钥分发

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-03-02 DOI: 10.1007/s11433-025-2900-6

Shi-Gen Li, Chen-Long Li, Jing-Wei Bian, Zhiguo Huang, Hua-Lei Yin, Zeng-Bing Chen

引用次数: 0

CUBE2: A parallel N-body simulation code for scalability, accuracy, and memory efficiency CUBE2：用于可伸缩性、准确性和内存效率的并行n体仿真代码

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-02-28 DOI: 10.1007/s11433-025-2926-0

Hao-Ran Yu, Bing-Hang Chen, Kun Xu, Ming-Jie Sheng, Jiaxin Han, Yipeng Jing, Huahua Cui

{"title":"CUBE2: A parallel N-body simulation code for scalability, accuracy, and memory efficiency","authors":"Hao-Ran Yu, Bing-Hang Chen, Kun Xu, Ming-Jie Sheng, Jiaxin Han, Yipeng Jing, Huahua Cui","doi":"10.1007/s11433-025-2926-0","DOIUrl":"10.1007/s11433-025-2926-0","url":null,"abstract":"<div>N-body simulation serves as a critical method for modeling cosmic evolution and poses a significant challenge in high-performance computing. We present CUBE2, an open-source cosmological N-body code emphasizing memory efficiency, computational performance, scalability, and precision. The core of its algorithm utilizes a multi-level particle-mesh (PM) method to solve the Poisson equation for matter distribution, leveraging the well-optimized fast Fourier transform (FFT) for computational efficiency. Precision is ensured by the optimized Green’s function that seamlessly bridges gravitational interactions between multi-level PM and particle-particle (PP) calculations. The program design enhances per-core/node efficiency in processing N-body particles, while the information optimized storage (IOS) addresses memory constraints for large particle counts. Using CUBE2, we run two cosmological simulations with particle counts of 61443 on the Advanced Computing East China Sub-center (ACECS) to test performance and accuracy.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 6","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147363249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0