Science China Physics, Mechanics & Astronomy最新文献_第4页

Scaling law for three-body collisions near a narrow s-wave Feshbach resonance 窄s波费什巴赫共振附近三体碰撞的标度律

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-08-05 DOI: 10.1007/s11433-025-2734-6

Jiaming Li, Shuai Peng, Yirou Xu, Shiyin Kuang, Le Luo

{"title":"Scaling law for three-body collisions near a narrow s-wave Feshbach resonance","authors":"Jiaming Li, Shuai Peng, Yirou Xu, Shiyin Kuang, Le Luo","doi":"10.1007/s11433-025-2734-6","DOIUrl":"10.1007/s11433-025-2734-6","url":null,"abstract":"<div>Ultracold atomic gases provide a controllable system to investigate the universal scaling laws of three-body physics, that is how the three-body recombination depends on the two-body scattering length. Although these scaling laws have been carefully examined in the bosonic systems, their manifestation in fermionic systems remain elusive. In this study, we investigate the three-body atomic loss rate L3 in a two-component 6Li Fermi gas with a negative scattering length a < 0. Our experimental results indicate that the scaling law exists near the narrow s-wave Feshbach resonance, characterized by L3 ∝ ∣a∣2.60. This scaling is observed to be valid only within a certain range of a, breaking down at both extremes. On one end, in the unitary regime where ∣a∣ approaches infinity, the collisional rate becomes independent of a. On the other end, as a approaches zero, a change in the length scale occurs, resulting in L3 ∝ r\u0000 2.30vdw\u0000 \u0000 , where the van der Waals length rvdw becomes the dominate scaling length. This study resolves the puzzle of the scaling law on the Bardeen-Cooper-Schrieffer (BCS) side of a two-component Fermi gas, shedding light on the universal physics in few-body systems.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 12","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162322","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

A new type of fine spectral structure in the solar radio emission 太阳射电发射中一种新型的精细光谱结构

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-08-04 DOI: 10.1007/s11433-025-2733-3

Alexey Kuznetsov

引用次数: 0

(Toverline{T}) deformation: Introduction and some recent advances (Toverline{T}) 变形：介绍和一些最新进展

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-08-04 DOI: 10.1007/s11433-025-2708-2

Song He, Yi Li, Hao Ouyang, Yuan Sun

{"title":"(Toverline{T}) deformation: Introduction and some recent advances","authors":"Song He, Yi Li, Hao Ouyang, Yuan Sun","doi":"10.1007/s11433-025-2708-2","DOIUrl":"10.1007/s11433-025-2708-2","url":null,"abstract":"<div>This review explores recent advances in the theory of (Toverline{T}) deformation, an irrelevant yet solvable deformation of quantum field theories defined via the quadratic form of the energy-momentum tensor. It addresses classical and quantum aspects, highlighting significant developments across various fields, including field theory, holography, and string theory. Classically, (Toverline{T}) deformation manifests through multiple geometric interpretations, notably random geometry, Jackiw-Teitelboim-like gravity, and uniform light-cone gauge frameworks. For quantum aspects, the deformation introduces notable features such as non-locality, UV-IR mixing, solvable renormalization structures, and intriguing modifications to correlation functions and entanglement properties. Furthermore, the paper examines the profound relationship between (Toverline{T}) deformation and holography, particularly within the mixed boundary conditions/cutoff AdS holography proposal and holographic entanglement entropy. Connections to string theory through single-trace deformations and their holographic duals further reveal the deformed structure of the worldsheet. This review synthesizes recent developments and outlines potential directions for future research in the study of (Toverline{T})-like deformation.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 10","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161868","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

Physics-informed neural networks for phase-based material defect identification 基于相的材料缺陷识别的物理信息神经网络

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-08-01 DOI: 10.1007/s11433-025-2692-7

Haoshen He, Yang Liu

{"title":"Physics-informed neural networks for phase-based material defect identification","authors":"Haoshen He, Yang Liu","doi":"10.1007/s11433-025-2692-7","DOIUrl":"10.1007/s11433-025-2692-7","url":null,"abstract":"<div>The accurate identification of material defects is critical for ensuring structural integrity and performance. Traditional computational methods often struggle to balance efficiency and physical fidelity in complex material systems. This paper presents a novel approach integrating physics-informed neural networks (PINNs) with the phase field method to address these challenges. Our approach leverages a phase field variable to delineate intact regions from voids, while a stress degradation model modifies mechanical responses at defect sites. Neural networks serve as surrogate forward solvers to predict displacement and stress fields, enabling rapid simulations. To ensure compatibility with physical laws, the framework embeds governing equations into the training loss function. Additionally, a data-driven term minimizes discrepancies between simulated and experimentally measured strain fields, enhancing defect localization precision. Numerical experiments validate the framework’s robustness across diverse configurations, including circular, elliptical, irregular, and multiple voids, as well as material behaviors, extending from linear elastic to hyperelastic models. The results demonstrate superior accuracy in identifying void geometry, size, and spatial distribution compared to conventional methods. The proposed approach’s adaptability to complex geometries and material nonlinearities highlights its broad applicability in aerospace, automotive, and biomedical industries.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160548","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

A novel fine spectral structure of solar radio bursts with periodic beaded stripes observed by CBSm of CMP-II 用CMP-II的CBSm观测到的具有周期性串珠条纹的太阳射电暴的新的精细光谱结构

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-29 DOI: 10.1007/s11433-025-2716-4

Chuanyang Li, Yao Chen, Bing Wang, Ze Zhong, Baolin Tan, Zongjun Ning, Hao Ning, Xiangliang Kong, Shuwang Chang, Yanke Tang, Ning Gai, Li Deng, Jingye Yan, Fabao Yan

{"title":"A novel fine spectral structure of solar radio bursts with periodic beaded stripes observed by CBSm of CMP-II","authors":"Chuanyang Li, Yao Chen, Bing Wang, Ze Zhong, Baolin Tan, Zongjun Ning, Hao Ning, Xiangliang Kong, Shuwang Chang, Yanke Tang, Ning Gai, Li Deng, Jingye Yan, Fabao Yan","doi":"10.1007/s11433-025-2716-4","DOIUrl":"10.1007/s11433-025-2716-4","url":null,"abstract":"<div>A novel fine spectral structure in solar radio bursts has been discovered using the Chashan broadband solar radio spectrometer at meter wavelengths (CBSm), an instrument of the Chinese Meridian Project-Phase II (CMP-II). The structure features periodic narrow-band stripes with a typical recurrence time < 1 s (occasionally reaching 8 s), often drifting from high to low frequencies and accompanied by absorptions, with trailing stripes appearing at the end of preceding ones. Some stripes exhibit periodic beaded (or pearl-like) enhancements with a periodicity of ∼0.1 s. The beaded stripes are reported for the first time ever. Data from the DAocheng Radio Telescope (DART) indicate a radio emission brightness temperature exceeding 109 K, originating above brightening loops in active region AR 13664. We proposed a novel generation mechanism of the periodic stripes on the basis of the double plasma resonance (DPR) instability, and explained the beaded substructure in terms of modulation by low-frequency magnetohydrodynamic (MHD) waves. The study highlights the CBSm’s capability to detect high-resolution fine spectral structures and offers novel insights into the emission mechanism and source characteristics of solar radio bursts.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 10","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171437","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

Information-theoretically secure quantum timestamping with one-time universal hashing 具有一次性通用散列的信息理论上安全的量子时间戳

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-29 DOI: 10.1007/s11433-025-2709-x

Ming-Yang Li, Chen-Xun Weng, Wen-Bo Liu, Mengya Zhu, Zeng-Bing Chen

引用次数: 0

Hard-magnetic soft continuum robots: Modeling, design and applications 硬磁软连续体机器人：建模、设计与应用

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-28 DOI: 10.1007/s11433-025-2729-4

Jiyu Li, Shanshan Wan, Lidan Tan, Khalid Shah, Liu Wang

{"title":"Hard-magnetic soft continuum robots: Modeling, design and applications","authors":"Jiyu Li, Shanshan Wan, Lidan Tan, Khalid Shah, Liu Wang","doi":"10.1007/s11433-025-2729-4","DOIUrl":"10.1007/s11433-025-2729-4","url":null,"abstract":"<div>Magnetic soft continuum robots (MSCRs) integrate remote and untethered actuation capability and inherent biocompatible nature of magnetic fields with the compliance of soft components, holding significant potential in biomedical applications. Among various MSCRs, hard-magnetic soft continuum robots (hMSCRs), leveraging materials with hard-magnetic properties, have attracted increasing attention due to their programmable magnetization and large reversible deformations. This review summarizes recent progress in hMSCRs, focusing on the modeling, design, and biomedical applications. First, we introduce fundamental characteristics, actuation mechanisms, and constitutive modeling frameworks of hard-magnetic soft materials. Then, we discuss several typical static and dynamic modeling approaches for two primary categories of hMSCRs: permanent magnet-based and magnetic particle-based systems. Next, design strategies emphasizing structural versatility and functionality are then presented for both types of hMSCRs. Finally, representative biomedical applications in navigation and endoscopy are highlighted, underscoring the transformative potential of hMSCR technologies in clinical practice.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 10","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169911","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

Navigation in the future: Review of quantum sensing in navigation 未来的导航：量子传感在导航中的研究进展

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-25 DOI: 10.1007/s11433-025-2699-1

Hongyu Pei, Wenfeng Fan, Lihong Duan, Feng Liu, Haoying Pang, Runbing Li, Yanying Feng, Yuanxing Liu, Yu Wang, Heng Yuan, Jun Tang, Huijie Zheng, Jie Qin, Wei Quan

{"title":"Navigation in the future: Review of quantum sensing in navigation","authors":"Hongyu Pei, Wenfeng Fan, Lihong Duan, Feng Liu, Haoying Pang, Runbing Li, Yanying Feng, Yuanxing Liu, Yu Wang, Heng Yuan, Jun Tang, Huijie Zheng, Jie Qin, Wei Quan","doi":"10.1007/s11433-025-2699-1","DOIUrl":"10.1007/s11433-025-2699-1","url":null,"abstract":"<div>Quantum navigation, based on the principles of quantum mechanics, holds transformative potential for future positioning, nav- igation, and timing (PNT) systems. Compared to traditional Global Navigation Satellite Systems (GNSS), quantum navigation offers superior precision and robustness, particularly in challenging environments such as deep-sea exploration, space missions, and military applications where signal disruptions are common. This paper systematically reviews the fundamental principles of quantum navigation devices, tracing their research and development progress while analyzing the technical challenges and limitations faced in current studies. Quantum inertial measurement devices play a pivotal role in these systems, including atom interferometer gyroscopes and accelerometers, spin-exchange relaxation-free (SERF) atomic spin gyroscopes, nuclear magnetic resonance gyroscopes (NMRGs), and nitrogen-vacancy (NV) center-based sensors. These devices exploit quantum phenomena such as atom interference, spin precession, and quantum coherence to achieve unprecedented sensitivity in measuring angular velocity, acceleration, and gravitational forces. Each of these technologies presents unique advantages in terms of precision and long-term stability, offering potential breakthroughs in autonomous navigation. Furthermore, the paper explores future directions for quantum navigation, identifying key obstacles such as environmental noise, miniaturization challenges, and the high costs associated with quantum sensors. Finally, it emphasizes the critical importance of quantum state preparation, protection, ma- nipulation, and detection. Effective control over these processes will determine the success of quantum navigation systems in providing reliable, highly accurate solutions across a wide range of complex operational environments.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169344","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

Intertwined charge and spin instability of La3Ni2O7 La3Ni2O7的缠绕电荷和自旋不稳定性

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-25 DOI: 10.1007/s11433-025-2702-7

Guiwen Jiang, Chenye Qin, Kateryna Foyevtsova, Liang Si, Mona Berciu, George A. Sawatzky, Mi Jiang

{"title":"Intertwined charge and spin instability of La3Ni2O7","authors":"Guiwen Jiang, Chenye Qin, Kateryna Foyevtsova, Liang Si, Mona Berciu, George A. Sawatzky, Mi Jiang","doi":"10.1007/s11433-025-2702-7","DOIUrl":"10.1007/s11433-025-2702-7","url":null,"abstract":"<div>Research on nickel-based superconductors has progressed from infinite-layer LaNiO2 to finite-layer La6Ni5O12, and most recently to the Ruddlesden-Popper phase La3Ni2O7, which was found to exhibit onset of superconductivity at ∼80 K under a pressure of ∼16 GPa. Using density functional calculations and multi-orbital, multi-atom cluster exact diagonalization that includes local exchange and Coulomb interactions, here we analyze the pressure dependent low-energy electronic states of the Ni2O9 cluster, relevant for the bilayer phase of La3Ni2O7. We quantify the various possible spin states and the exchange and superexchange mechanisms of the Ni2O9 cluster are quantified through the involvement of the ({rm{Ni}}-3d_{3z^2-r^2}) orbitals and the atomic Hund’s rule exchange, the apical bridging O-2pz orbitals, and the orbitals involved in the formation of local Zhang-Rice singlet like states. We find that the leading configurations contributing to the cluster ground-states both for nominal valence and also with local charge fluctuations, do not involve occupation of the apical oxygen; instead, they favor the formation of in-plane Zhang-Rice singlet-like states between an O ligand hole and the Ni (3d_{z^2-y^2}) orbital. We also highlight two possible charge and spin ordered states suggested by our cluster results, that are nearly degenerate at all relevant pressures within our modeling.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168656","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

A unified thermodynamic picture for the glass transition and liquid fragility 玻璃化转变和液体易碎性的统一热力学图

IF 7.5 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-07-22 DOI: 10.1007/s11433-025-2707-5

Lijian Song, Meng Gao, Juntao Huo, Li-Min Wang, Yuanzheng Yue, Jun-Qiang Wang

{"title":"A unified thermodynamic picture for the glass transition and liquid fragility","authors":"Lijian Song, Meng Gao, Juntao Huo, Li-Min Wang, Yuanzheng Yue, Jun-Qiang Wang","doi":"10.1007/s11433-025-2707-5","DOIUrl":"10.1007/s11433-025-2707-5","url":null,"abstract":"<div>Glass transition is a reversible transition that occurs in most amorphous materials. However, the nature of glass transition remains far from being clarified. A key to understand the glass transition is to clarify what determines the glass transition temperature (Tg) and liquid fragility (m). Here the glass transition thermodynamics for 150 different glass-forming systems are studied statistically. It is found that the activation characters in the energy landscape are crucial to precisely portray the glass transition and, in particular, both the activation free energy (G*) and the activation entropy (S*) play critical roles. G* determines Tg, Tg=G*/290+25.5, while S* determines m, m=S*/RRln10+15, where R is the gas constant. Based on the Boltzmann definition of entropy, the fragility is an indication of the number of the degeneracy of the evolution paths. This explains why the nano-confined, low-dimension or high-pressured glasses exhibit stronger characteristics, which has been a puzzling phenomenon for a long time.</div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":7.5,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168544","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