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Antiferromagnetic Order and Possible Quantum Spin Liquid in Kagome Antiferromagnet LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)]

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Chinese physics Letters 2025年第2期42卷 255-259页

作者： Zezhong Li Lankun Han Yili Sun Shanshan Zhang Zhenyuan Zeng Shiliang Li Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China

Recent studies on the kagome lattice YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br)have provided promising evidence for the existence of Dirac quantum spin *** this study,we synthesized a new compound,LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)],which has two types of structures with two different space groups,P3m1 and *** type-Ⅰ sample with a space group of P3m1 had undistorted Cu^(2+)kagome planes and orders magnetically below approximately 1.5 *** type-Ⅱ sample had a larger unit cell with a space group of R3 and distorted kagome *** magnetic ordering was observed,and the low-temperature specific heat behaved like a Dirac quantum spin liquid,including a quadratic temperature dependence at zero field and an additional linear𝑇term under magnetic *** comparing the structures with those of YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br),we show that the quantum spin liquid ground state may have a deep connection with the𝐽J■-J-J′Heisenberg model in the kagome lattice.

关键词： distorted x) quantum

On the Multi-q Characteristics of Magnetic Ground States of Honeycomb Cobalt Oxides

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Chinese physics Letters 2025年第2期42卷 98-108页

作者： Yuchen Gu Xianghong Jin Yuan Li International Center for Quantum materials School of PhysicsPeking UniversityBeijing 100871China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The Kitaev honeycomb model has received significant attention due to its exactly solvable quantum spin liquid ground states and fractionalized *** cobalt oxides have been considered as a promising platform for realizing this ***,in contrast to the conventional wisdom regarding the single-q zigzag magnetic order inferred from previous studies of the candidate materials Na_(2)IrO_(3) and α-RuCl_(3),recent experiments on two representative honeycomb cobalt oxides,hexagonal Na_(2)Co_(2)TeO_(6) and monoclinic Na_(3)Co_(2)SbO_(6),have uncovered evidence for more complex multi-q zigzag order *** review surveys the experimental strategies used to distinguish between single-and multi-q orders,along with the crystallographic symmetries of cobalt oxides,in comparison with previously studied *** general formation mechanism of multi-q order is also briefly *** goal is to provide a solid ground for examining the relevance of multi-q order in honeycomb cobalt oxides and discuss its implications for the microscopic model of these intriguing quantum magnets.

关键词： cobalt oxides quantum

Preformed Cooper pairs in a triclinic iron pnictide superconductor

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Science China(physics,Mechanics & Astronomy) 2025年第04期Mechanics & Astronomy) .卷 202-214页

作者： Zezhong Li Wenshan Hong Honglin Zhou Xiaoyan Ma Uwe Stuhr Kaiyue Zeng Long Ma Ying Xiang Huan Yang Hai-Hu Wen Jiangping Hu Shiliang Li Huiqian Luo Beijing National Laboratory for condensed matter physics Institute of Physics Chinese Academy of Sciences University of Chinese Academy of sciences International Center for Quantum materials School of Physics Peking University Laboratory for Neutron Scattering and Imaging Paul Scherrer Institute Anhui Province Key Laboratory of condensed matter physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of Sciences National Laboratory of Solid State Microstructures and department of physics Collaborative Innovation Center of Advanced MicrostructuresNanjing University Songshan Lake materials Laboratory

Electron pairing along with phase coherence generates superconductivity below the critical temperature （Tc）.In underdoped highTccuprates,these two quantum phenomena may occur at separate temperatures,which was lately confirmed in the quasi-twodimensional （quasi-2D） iron chalcogenide ***,we report a systematic investigation on the pre-pairing behavior in a triclinic iron pnictide superconductor (Ca0.85La0.15)10（Pt3As8）(Fe2As2)5with Tc≈30 K,where the superconductivity is quasi-2D manifested by the Berezinskii-Kosterlitz-Thouless *** neutron scattering experiments unambiguously reveal a spin resonance peak around ER=13 me V in the superconducting state,but its intensity continuously decreases when warming up across Tc,accompanied with an anomaly around T*≈45 K in spin correlations,and a suppression by an in-plane magnetic field persisting to the same *** T*,a significant Nernst signal and a reduction of density of states at the Fermi level are also *** results suggest that the precursor of spin resonance is highly related to the preformed Cooper pairs driven by phase fluctuations,much like the pseudogap case in cuprates.

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Topological origin of non-Hermitian skin effect in higher dimensions and uniform spectra

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Science Bulletin 2025年第1期70卷 51-57页

作者： Haiping Hu Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China

The non-Hermitian skin effect is an iconic phenomenon characterized by the aggregation of eigenstates near the system boundaries in non-Hermitian *** extensively studied in one dimension,understanding the skin effect and extending the non-Bloch band theory to higher dimensions encounter a formidable challenge,primarily due to infinite lattice geometries or open boundary *** work adopts a point-gap perspective and unveils that non-Hermitian skin effect in all spatial dimensions originates from point *** introduce the concept of uniform spectra and reveal that regardless of lattice geometry,their energy spectra are universally given by the uniform spectra,even though their manifestations of skin modes may *** on the uniform spectra,we demonstrate how to account for the skin effect with generic lattice cuts and establish the connections of skin modes across different geometric shapes via momentum-basis *** findings highlight the pivotal roles point gaps play,offering a unified understanding of the topological origin of non–Hermitian skin effect in all dimensions.

关键词： Non-Hermitian skin effect Uniform spectra Point gap Band theory

Great influence of demagnetization history on internal interaction and magnetization process of mischmetal-based magnets

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 183-192页

作者： Dan Liu Jiefu Xiong Lichen Wang Xinqi Zheng Xin Ming Jiaying Jin Jiazheng Hao He Bai Zhenxing Li Tongyun Zhao Fengxia Hu Jirong Sun Jun Shen Baogen Shen department of physics Beijing Technology and Business UniversityBeijing 10048China Ningbo Institute of materials Technology&Engineering Chinese Academy of SciencesNingbo 31521China School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of materials Science and Engineering Zhejiang UniversityHangzhou 310027China Spallation Neutron Source Science Center Dongguan 523803China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 101408China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

The magnetization process and corresponding magnetization curve are usually used to analyze the coercivity mechanism of NdFe-B based sintered ***,different demagnetization histories will seriously influence the magnetization curve,leading to an inaccurate understanding and analysis of magnetization *** this work,we investigated the magnetization behavior of multi-main phase(MMP)magnets with thermal demagnetized and alternating current demagnetized *** curves of initial magnetization process and demagnetization process of thermal demagnetized magnets reflect the movement of domain walls inside the grains and the magnetization interaction between the grains,*** is noted that the former process cannot represent the magnetization reversal of the entire magnet,which is not appropriate to analyze coercivity mechanism *** the recoil curves of both two processes of AC demagnetized magnets can illustrate the magnetization reversal of the entire grains and the interaction between ***-optical Kerr microscope shows that the grains of thermal demagnetized magnets are in multi-domain states,and the grains of AC demagnetized magnets are almost in singledomain *** walls of thermal demagnetized magnets move easily within the grains,which is more conducive to magnetization saturation in industrial *** addition,the minorloops of thermal demagnetized magnets can independently represent the transition of grains from multi-domain to single-domain and the demagnetization of single-domain grains,which is equivalent to characterizing the internal interactions by recoil *** investigation of magnetization characteristics of MMP sintered magnets starting from different demagnetized states is helpful to further understand the internal interaction and magnetic hardening mechanism.

关键词： permanent magnet demagnetization history magnetization reversal misch-metal rare earth

Emergent 3×3 charge order on the Cs reconstruction of kagome superconductor CsV3Sb5

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Chinese physics B 2025年第1期34卷 46-51页

作者： Xianghe Han Zhongyi Cao Zihao Huang Zhen Zhao Haitao Yang Hui Chen Hong-Jun Gao Beijing National Center for condensed matter physics and Institute of physics Chinese Academy of SciencesBeijing 100190China School of Physical sciences University of Chinese Academy of SciencesBeijing 100049China Hefei National Laboratory Hefei 230088China

The alkali adatoms with controlled coverage on the surface have been demonstrated to effectively tune the surface band of quantum materials through in situ electron ***,the interplay of orderly arranged alkali adatoms with the surface states of quantum materials remains ***,by using low-temperature scanning tunneling microscopy/spectroscopy(STM/S),we observed the emergent 3×3 super modulation of electronic states on the√3×√3R30°(R3)Cs ordered surface of kagome superconductor *** nondispersive 3×3 superlattice at R3 ordered surface shows contrast inversion in positive and negative differential conductance maps,indicating a charge order *** 3×3 charge order is suppressed with increasing temperature and undetectable at a critical temperature of~62 ***,in the Ta substituted sample CsV_(2.6)Ta_(0.4)Sb_(5),where long-range 2×2×2 charge density wave is significantly suppressed,the 3×3 charge order on the R3 ordered surface becomes blurred and much weaker than that in the undoped *** indicates that the 3×3 charge order on the R3 ordered surface is directly correlated to the bulk charge density waves in CsV_(3)Sb_(5.O)ur work provides a new platform for understanding and manipulating the cascade of charge orders in kagome superconductors.

关键词： CsV3Sb5 surface reconstruction alkali atoms charge order scanning tunneling microscope/spectroscopy

Reveal short range interactions between u/d quarks in the NN,D_(03),and D_(30)systems

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 102-111页

作者： Qi-Fang Lü Yu-Bing Dong Peng-Nian Shen Zong-Ye Zhang department of physics Hunan Normal UniversityChangsha410081China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha410081China Key Laboratory for matter Microstructure and Function of Hunan Province Hunan Normal UniversityChangsha410081China Institute of High Energy physics Chinese Academy of SciencesBeijing100049China School of Physical sciences University of Chinese Academy of SciencesBeijing101408China

The dynamic mechanism of short range interactions between u/d quarks remains an open and challenging *** order to reveal this quark dynamics,we perform a systematic analysis of N N,D_(03),and D_(30)systems in the(extended)chiral SU(3)constituent quark *** comparing results calculated with different models and different parameter sets,the effects of one gluon exchange and vector meson exchange terms are carefully *** results indicate that the vector meson exchange interactions dominate the short range interactions between u/d quarks,whereas the small residual one gluon exchange coupling strength is also allowed.

关键词： short range interactions dibaryons constituent quark models

Revealing Light-Induced Charge Density Wave Melting and Carrier Redistribution in 1T-TiSe_2

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Chinese physics Letters 2025年第1期42卷 123-133页

作者： Wanying Chen Haoyuan Zhong Changhua Bao Fei Wang Xuanxi Cai Chenxia Yun Hao Teng Zhiyi Wei Shuyun Zhou State Key Laboratory of Low-Dimensional Quantum physics and department of physics Tsinghua UniversityBeijing 100084China Beijing National Laboratory for condensed matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Frontier Science Center for Quantum Information Beijing 100084China

Capturing ultrafast dynamics over a large momentum space is critical for revealing the relationship between the electronic and structural modulations in quantum ***,by performing time-and angle-resolved photoemission spectroscopy measurements at the Synergetic Extreme Condition User Facility(SECUF)equipped with an extreme ultraviolet light source,we reveal the ultrafast dynamics of a charge-density wave(CDW)material,1T-TiSe_(2),upon ***-induced CDW melting is revealed from two aspects:gap closing of the CDW at the Brillouin zone(BZ)center and weakening of the CDW folded band at the BZ *** comparing the transient electronic structure and spectral weight over a large momentum space,we further reveal the carrier redistribution involving the excitation of electrons from theГpoint to the M *** study provides a comprehensive picture of the physics and ultrafast dynamics of a CDW material across the entire BZ.

关键词： momentum equipped distribution

Edge supercurrent in Josephson junctions based on topological materials

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 1-12页

作者： Junjie Qi Chui-Zhen Chen Juntao Song Jie Liu Ke He Qing-Feng Sun X.C.Xie Beijing Academy of Quantum Information sciences Beijing 100193China School of Physical Science and Technology Soochow UniversitySuzhou 215006China Institute for Advanced Study Soochow UniversitySuzhou 215006China College of physics and Hebei Advanced Thin Films Laboratory Hebei Normal UniversityShijiazhuang 050024China School of physics Xi’an Jiaotong UniversityMinistry of Education Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed MatterXi’an 710049China State Key Laboratory of Low Dimensional Quantum physics Department of PhysicsTsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China Hefei National Laboratory Hefei 230088China International Center for Quantum materials School of PhysicsPeking UniversityBeijing 100871China Interdisciplinary Center for Theoretical physics and Information sciences Fudan UniversityShanghai 200433China

The interplay between novel topological states and superconductivity has garnered substantial interest due to its potential for topological quantum *** Josephson effect serves as a useful probe for edge superconductivity in these hybrid topological *** Josephson junctions based on topological materials,supercurrents exhibit unique quantum interference patterns,including the conventional Fraunhofer oscillations,theΦ_(0)-periodic oscillation,and the 2Φ_(0)-periodic oscillation in response to the external magnetic field(Φ_(0)=h/2e is the flux quantum,h the Planck constant,and e the electron charge).These interference patterns stem from varied Andreev reflection mechanisms and the associated current density *** review seeks to comprehensively examine the theoretical and experimental advancements in understanding the quantum interference patterns of edge supercurrents in Josephson junctions based on quantum spin Hall,quantum Hall,and quantum anomalous Hall systems.

关键词： quantum Hall effect quantum spin Hall effect quantum anomalous Hall effect Josephson junction edge supercurrent Andreev reflection