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Interlayer Magnetic Interaction in the CrI_(3)/CrSe_(2) Heterostructure

Chinese Physics Letters 2024年第5期41卷 85-89页

作者：王秋皓倪美燕李淑静郑法伟路洪艳张平 School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China Center for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and MeasurementSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Based on first-principles calculations, we systematically study the stacking energy and interlayer magnetic interaction of the heterobilayer composed of CrI_(3) and CrSe_(2) monolayers. It is found that the stacking order plays a crucial role in the interlayer magnetic coupling. Among all possible stacking structures, the AA-stacking is the most stable heterostructure, exhibiting interlayer antiferromagnetic interactions. Interestingly, the interlayer magnetic interaction can be effectively tuned by biaxial strain. A 4.3% compressive strain would result in a ferromagnetic interlayer interaction in all stacking orders. These results reveal the magnetic properties of CrI_(3)/CrSe_(2) heterostructure, which is expected to be applied to spintronic devices.

关键词： strain stacking interlayer

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Magnetoresistance hysteresis in the superconducting state of kagome CsV_(3)Sb_(5)

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Chinese Physics B 2024年第10期33卷 30-34页

作者： Tian Le Jinjin Liu Zhiwei Wang Xiao Lin Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province Department of PhysicsSchool of Science and Research Center for Industries of the FutureWestlake UniversityHangzhou 310030China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

The hysteresis of magnetoresistance observed in superconductors is of great interest due to its potential connectionwith unconventional *** this study,we perform electrical transport measurements on kagome superconductorCsV_(3)Sb_(5)nanoflakes and uncover unusual hysteretic behavior of magnetoresistance in the superconducting *** hysteresis can be induced by applying either a large DC or AC current at temperatures(T)well below the superconductingtransition temperature(T_(c)).As T approaches T_(c),similar weak hysteresis is also detected by applying a *** scenarios are discussed,with particular focus on the effects of vortex pinning and the presence of timereversal-symmtery-breaking superconducting *** findings support the latter,hinting at chiral superconductivityin kagome superconductors.

关键词： hysteresis magnetoresistance kagome superconductor chiral superconductor

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Crossed real nodal-line phonons in gold monobromide

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Physical Review B 2024年第18期110卷 184303页

作者： Yilin Han Yichen Liu Chaoxi Cui Cheng-Cheng Liu Zhi-Ming Yu Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China

Space-time inversion symmetry can generate intriguing types of spinless excitations in crystalline materials. Here, we propose a topological phase protected by space-time inversion symmetry—the crossed real nodal line (RNL) in the phonon spectrum of gold monobromide (AuBr). In AuBr, there exist four straight nodal lines, which are linked by a crossed nodal line formed by two lower bands. Remarkably, each adjacent two of the four straight nodal lines is a pair, forming a crossed RNL with nontrivial real Chern number. Such configuration and pairing mode of RNL have never been reported. The crossed RNL exhibits unique surface and hinge states distinguished from that of the conventional RNLs. The symmetry protection and the transformation under the symmetry-preserving strain of the crossed RNL are also investigated. Our results open the door to a new class of topological states and predict its realization in experimentally synthesized material.

关键词： First-principles calculations Phonons Topological materials Topological phases of matter 3-dimensional systems

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Fully Polarized Topological Isostatic Metamaterials in Three Dimensions

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Physical Review Letters 2024年第10期133卷 106101页

作者： Zheng Tang Fangyuan Ma Feng Li Yugui Yao Di Zhou Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics <a href="https://***/01skt4w74">Beijing Institute of Technology</a> Beijing 100081 China.

Topological surface states are unique to topological materials and are immune to disturbances. In isostatic lattices, mechanical topological floppy modes exhibit softness depending on the polarization relative to the terminating surface. However, in three dimensions, the polarization of topological floppy modes is disrupted by the ubiquitous mechanical Weyl lines. Here, we demonstrate, both theoretically and experimentally, the fully polarized topological mechanical phases free of Weyl lines. Floppy modes emerge exclusively on a particular surface of the three-dimensional isostatic structure, leading to the strongly asymmetric stiffness between opposing boundaries. Additionally, uniform soft strains can reversibly shift the lattice configuration to Weyl phases, switching the stiffness contrast to a trivially comparable level. Our work demonstrates the fully polarized topological mechanical phases in three dimensions, and paves the way towards engineering soft and adaptive metamaterials.

关键词： Classical mechanics Elasticity Phase transitions Surface states Topological phases of matter 3-dimensional systems

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Engineering strong spin-frustration at the surface of three-dimensional graphene

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Science Bulletin 2024年第18期69卷 2816-2819页

作者： Wenjing Li Ken Chen Menglei Li Huiying Gao Jize Zhao Fawei Zheng Wenhui Duan Center for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physical Science and Technology Key Laboratory of Quantum Theory and Applications of MOELanzhou UniversityLanzhou 730000China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu ProvinceLanzhou UniversityLanzhou 730000China Department of Physics Capital Normal UniversityBeijing 100048China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Institute for Advanced Study Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

Since the first successful fabrication in 2004[1],graphene has received tremendous attention due to its extremely simple atomic structure and alluring physical *** example,its massless low energy excitations have a linear dispersion and thus its transport property is governed by Dirac equation instead of Schr?dinger *** special electronic structures suppress the intra-valley and inter-valley backscatterings,leading to the half-integer and fractional quantum Hall effect[2]under magnetic field and the relativistic quantum tunneling described by the Klein paradox[3].

关键词： properties equation quantum

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Migration of an active particle in mixtures of rigid and flexible rings

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Physical Review E 2025年第3期111卷 035412-035412页

作者： Meng-Yuan Li Ning Zheng Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

The migration of active particles in slowly moving, crowded, and heterogeneous media is fundamental to various biological processes and technological applications. In this study, we numerically investigate the dynamics of a single active particle in a multicomponent medium composed of mixtures of rigid and flexible rings. We observe a nonmonotonic dependence of diffusivity on the relative fraction of rigid to flexible rings, leading to the identification of an optimal composition for enhanced diffusion. This long-time nonmonotonic diffusion, resulting from the different responses of the active particle to rigid and flexible rings, is coupled with transient short-time trapping. The probability distribution of trapping durations is well described by the herein-proposed extended entropic-trap model. We further theoretically establish a universal relationship between particle activity and the optimal rigid-to-flexible ring ratio for diffusion, which aligns closely with our numerical results.

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General construction of three-dimensional Z2 monopole charge nodal line semimetals and prediction of abundant candidate materials

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Physical Review B 2025年第12期111卷 125101-125101页

作者： Yongpan Li Shifeng Qian Cheng-Cheng Liu Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

The interplay between symmetry and topology led to the concept of symmetry-protected topological states, including all noninteracting and weakly interacting topological quantum states. Among them, recently proposed nodal line semimetal states with space-time inversion (PT) symmetry which are classified by the Stiefel-Whitney characteristic class associated with real vector bundles and can carry a nontrivial Z2 monopole charge have attracted widespread attention. However, such three-dimensional (3D) Z2 nodal line semimetals have been poorly studied, such as how to construct them and how to predict them efficiently. We generally construct 3D Z2 nodal line semimetals by stacking of 2D PT-symmetric Dirac semimetals via nonsymmorphic symmetries. Based on our construction scheme, numerous models can be produced. Combined with first-principles calculations, we predict abundant candidate electronic and phononic materials for Z2 nodal line semimetals, namely two kinds of electronic materials: fourteen Si and Ge structures and 108 transition metal dichalcogenides MX2 (M=Cr, Mo, W, X=S, Se, Te) and one kind of phononic material: SiH. Our theoretical construction scheme can be directly applied to metamaterials and circuit systems. Our work greatly enriches the candidate materials and deepens the understanding of Z2 nodal line semimetal states.

关键词： Phonons

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Planar Hall plateau in magnetic Weyl semimetals

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Science Bulletin 2025年第2期70卷 187-192页

作者： Lei Li Chaoxi Cui Run-Wu Zhang Zhi-Ming Yu Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China International Center for Quantum Materials Beijing Institute of TechnologyZhuhai 519000China

Despite the rapid progress in the study of planar Hall effect(PHE)in recent years,all the previous works only showed that the PHE is connected to local geometric quantities,such as Berry ***,for the first time,we point out that the PHE in magnetic Weyl semimetals is directly related to a global quantity,namely,the Chern number of the Weyl *** leads to a remarkable consequence that the PHE observation predicted here is robust against many system details,including the Fermi *** main difference between non-magnetic and magnetic Weyl points is that the latter breaks time-reversal symmetry T,thus generally possessing an energy *** semiclassical Boltzmann theory,we investigate the PHE in generic magnetic Weyl models with energy tilt and arbitrary Chern *** find that by aligning the magnetic and electric fields in the same direction,the trace of the PHE conductivity contributed by Berry curvature and orbital moment is proportional to the Chern number and the energy tilt of the Weyl points,resulting in a previously undiscovered quantized PHE plateau by varying the Fermi *** further confirm the existence of PHE plateaus in a more realistic lattice model without T *** proposing a new quantized physical quantity,our work not only provides a new tool for extracting the topological character of the Weyl points but also suggests that the interplay between topology and magnetism can give rise to intriguing physics.

关键词： Magnetic Weyl semimetals Planar Hall effect Quantized plateau Chern number

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Excitonic Instability in Ta_(2)Pd_(3)Te_(5) Monolayer

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Chinese Physics Letters 2024年第9期41卷 57-62页

作者： Jingyu Yao Haohao Sheng Ruihan Zhang Rongtian Pang Jin-Jian Zhou Quansheng Wu Hongming Weng Xi Dai Zhong Fang Zhijun Wang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Department of Physics Hong Kong University of Science and TechnologyHong Kong 999077China

By systematic theoretical calculations,we reveal an excitonic insulator(EI)in the Ta_(2)Pd_(3)Te_(5)*** bulk Ta_(2)Pd_(3)Te_(5)is a van der Waals(vdW)layered compound,whereas the vdW layer can be obtained through exfoliation or molecular-beam ***-principles calculations show that the monolayer is a nearly zero-gap semiconductor with the modified Becke–Johnson *** to the same symmetry of the band-edge states,the two-dimensional polarization 2D would be finite as the band gap goes to zero,allowing for an EI state in the *** the first-principles many-body perturbation theory,the GW plus Bethe–Salpeter equation calculation reveals that the exciton binding energy is larger than the single-particle band gap,indicating the excitonic *** computed phonon spectrum suggests that the monolayer is dynamically stable without lattice *** findings suggest that the Ta_(2)Pd_(3)Te_(5) monolayer is an excitonic insulator without structural distortion.

关键词： monolayer principles calculations

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From surface loading to precise confinement of polyoxometalates for electrochemical energy storage

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Chinese Chemical Letters 2023年第12期34卷 29-41页

作者： Chongji Wang Yanhui Song Wenhua Cong Yuanyuan Yan Meiling Wang Jiadong Zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Instituteof TechnologyBeijing100081China Instrumental Analysis Center Taiyuan University of TechnologyTaiyuan 030024China

Because of abundant redox activity,broad tunability,and specific atomic structure,polyoxometalates(POMs or POM)clusters have attracted burgeoning interests in electrochemical especially energy stor-age ***,due to the high solubility and fully oxidized state,they often suffer from elec-trically insulation as well as chemical and electrochemical *** noncovalent loading or covalent grafting of POMs on conductive substrates have been successfully performed to overcome this ***,severe shedding or agglomeration of POMs arising from weak interactions with substrates or excessive entrapment or weak destruction in conductive supports cause significantly re-duced availability and *** this end,precise confinement of POMs into conductive supports has been tried to improve their dispersibility and ***,recent progress of PoMs from surface loading to precise confinement in the electrochemistry energy storage field is ***,we il-lustrate the typical non-confinement methods(*** and non-covalent)for supported POMs in energy storage ***,different strategies for precise confinement of PoMs in organic and inorganic materials for related applications are also ***,future research directions and opportunities for confined POMs,and derived ultrafine nanostructures are also *** re-view seeks to point out future research directions of supported PoMs in the electrochemistry-related fields.

关键词： Polyoxometalates Non-confinement Confinement Electrochemical energy storage Supercapacitor Battery

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