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quantum oscillations as a robust fingerprint of chiral anomaly in nonlinear response in Weyl semimetals

Physical Review B 2023年第8期107卷 L081107-L081107页

作者： Chuanchang Zeng Snehasish Nandy Pu Liu Sumanta Tewari Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Department of Physics University of Virginia Charlottesville Virginia 22904 USA Department of Physics and Astronomy Clemson University Clemson South Carolina 29634 USA

We investigate the nonlinear planar effects (NPEs) in Weyl semimetals (WSMs) starting from the semiclassical regime to the ultraquantum limit within the framework of Boltzmann transport theory incorporating Landau quantization. Based on our results, we propose quantum oscillations in the NPEs as a robust signature of the celebrated chiral anomaly (CA) in WSMs. By obtaining analytical expressions, we show that the quantum oscillations in the nonlinear regime exhibit two different periods in B−1 (B is the magnetic field) compared to the linear response regime with only one period in the inverse magnetic field. In addition, we obtain characteristic angular dependence of the CA-induced NPEs. We conclude that in light of the inconclusive sign of the CA-driven longitudinal magnetoconductance in WSMs as has been illustrated in recent theoretical work, the proposed behaviors of quantum oscillations in the nonlinear planar effects uniquely identify the existence of chiral anomaly in WSMs.

关键词： Landau levels Transport phenomena Weyl semimetal Boltzmann theory

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Kirigami/origami:unfolding the new regime of advanced 3D microfabrication/nanofabrication with“folding”

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Light(Science & Applications) 2020年第1期9卷 1309-1327页

作者： Shanshan Chen Jianfeng Chen Xiangdong Zhang Zhi-Yuan Li Jiafang Li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Physics and Optoelectronics South China University of Technology510640 GuangzhouChina

advanced kirigami/origami provides an automated technique for modulating the mechanical,electrical,magnetic and optical properties of existing materials,with remarkable flexibility,diversity,functionality,generality,and *** this paper,we review the latest progress in kirigami/origami on the microscale/nanoscale as a new platform for advanced 3D microfabrication/*** stimuli of kirigami/origami,including capillary forces,residual stress,mechanical stress,responsive forces,and focussed-ion-beam irradiation-induced stress,are introduced in the microscale/nanoscale *** stimuli enable direct 2D-to-3D transformations through folding,bending,and twisting of microstructures/nanostructures,with which the occupied spatial volume can vary by several orders of magnitude compared to the 2D *** an instant and direct method,ion-beam irradiation-based tree-type and close-loop nano-kirigami is highlighted in *** progress in microscale/nanoscale kirigami/origami for reshaping the emerging 2D materials,as well as the potential for biological,optical and reconfigurable applications,is briefly *** the unprecedented physical characteristics and applicable functionalities generated by kirigami/origami,a wide range of applications in the fields of optics,physics,biology,chemistry and engineering can be envisioned.

关键词： regime folding enable

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Asymmetric Fraunhofer pattern in Josephson junctions from heterodimensional superlattice V_(5)S_(8)

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Chinese Physics B 2022年第5期31卷 63-67页

作者： Juewen Fan Bingyan Jiang Jiaji Zhao Ran Bi Jiadong Zhou Zheng Liu Guang Yang Jie Shen Fanming Qu Li Lu Ning Kang Xiaosong Wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsPeking UniversityBeijing 100871China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Introduction of spin-orbit coupling(SOC)in a Josephson junction(JJ)gives rise to unusual Josephson *** investigate JJs based on a newly discovered heterodimensional superlattice V_(5)S_(8) with a special form of *** unique homointerface of our JJs enables elimination of extrinsic effects due to interfaces and *** observe asymmetric Fraunhofer patterns with respect to both the perpendicular magnetic field and the *** asymmetry is influenced by an in-plane magnetic *** of the pattern points to a nontrivial spatial distribution of the Josephson current that is intrinsic to the SOC in V_(5)S_(8).

关键词： Fraunhofer pattern Josephson junction spin-orbit coupling homointerface

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Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V1−xTax)3Sb5

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Physical Review Materials 2024年第1期8卷 014801-014801页

作者： Jinyulin Li Qing Li Jinjin Liu Ying Xiang Huan Yang Zhiwei Wang Yugui Yao Hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 China

There is a common belief that superconductivity and charge density wave (CDW) order accommodate homogenously in real space but compete with each other for the effective density of states in momentum space in CDW superconductors. By measuring resistivity along the c axis in Cs(V1−xTax)3Sb5, we observe strong superconducting fluctuation behavior coexisting with the CDW order in pristine CsV3Sb5, and the fluctuation region becomes narrowed when the Ta doping suppresses the CDW order. The onset transition temperature barely changes with the Ta doping. Therefore, the bulk superconductivity may be established by a doping-independent local pairing, and it can be suppressed in some regions by the spatially variable CDW order along the c axis. Our results violate the above-mentioned belief about CDW superconductors and demonstrate the intricate interaction between superconductivity and CDW order in this kagome superconductor.

关键词： Charge density waves Doping effects Superconducting fluctuations Superconductors Resistivity measurements

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Physics-driven generative adversarial networks empower single-pixel infrared hyperspectral imaging

arXiv

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arXiv 2023年

作者： Wang, Dong-Yin Bie, Shu-Hang Chen, Xi-Hao Yu, Wen-Kai Key Laboratory of Optoelectronic Devices and Detection Technology School of Physics Liaoning University Shenyang110036 China Center for Quantum Technology Research Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement of Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China

A physics-driven generative adversarial network (GAN) was established here for single-pixel hyperspectral imaging (HSI) in the infrared spectrum, to eliminate the extensive data training work required by traditional data-driven model. Within the GAN framework, the physical process of single-pixel imaging (SPI) was integrated into the generator, and the actual and estimated one-dimensional (1D) bucket signals were employed as constraints in the objective function to update the network’s parameters and optimize the generator with the assistance of the discriminator. In comparison to single-pixel infrared HSI methods based on compressed sensing and physics-driven convolution neural networks, our physics-driven GAN-based single-pixel infrared HSI can achieve higher imaging performance but with fewer measurements. We believe that this physics-driven GAN will promote practical applications of computational imaging, especially various SPI-based techniques. Copyright © 2023, The Authors. All rights reserved.

关键词： Hyperspectral imaging

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多带笼目超导体CsV_(3)Sb_(5)衍生体系的可调磁通涡旋束缚态

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Science Bulletin 2024年第7期69卷 885-892页

作者：黄子豪韩相和赵振刘锦锦李鹏飞谭恒心王秩伟姚裕贵杨海涛颜丙海蒋坤胡江平汪自强陈辉高鸿钧 Beijing National Center for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China 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 and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Department of Condensed Matter Physics Weizmann Institute of ScienceRehovot 7610001Israel Hefei National Laboratory Hefei 230088China Department of Physics Boston CollegeChestnut Hill MA 02467USA

Vortices and bound states offer an effective means of comprehending the electronic properties of ***,surface-dependent vortex core states have been observed in the newly discovered kagome superconductors CsV_(3)Sb_(5).Although the spatial distribution of the sharp zero energy conductance peak appears similar to Majorana bound states arising from the superconducting Dirac surface states,its origin remains *** this study,we present observations of tunable vortex bound states(VBSs)in two chemically-doped kagome superconductors Cs(V_(1-x)Tr_(x))_(3)Sb_(5)(Tr=Ta or Ti),using low-temperature scanning tunneling microscopy/*** CsV_(3)Sb_(5)-derived kagome superconductors exhibit full-gap-pairing superconductivity accompanied by the absence of long-range charge orders,in contrast to pristine CsV_(3)Sb_(5).Zero-energy conductance maps demonstrate a field-driven continuous reorientation transition of the vortex lattice,suggesting multiband *** Ta-doped CsV_(3)Sb_(5)displays the conventional cross-shaped spatial evolution of Caroli-de Gennes-Matricon bound states,while the Tidoped CsV_(3)Sb_(5)exhibits a sharp,non-split zero-bias conductance peak(ZBCP)that persists over a long distance across the *** spatial evolution of the non-split ZBCP is robust against surface effects and external magnetic field but is related to the doping *** study reveals the tunable VBSs in multiband chemically-doped CsV_(3)Sb_(5)system and offers fresh insights into previously reported Y-shaped ZBCP in a non-quantum-limit condition at the surface of kagome superconductor.

关键词： Kagome superconductor Chemical doping Vortex lattice transition Vortex bound states Majorana bound states

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Hidden Real Topology and Unusual Magnetoelectric Responses in Monolayer Antiferromagnetic Cr2Se2O

arXiv

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arXiv 2023年

作者： Gong, Jialin Wang, Yang Han, Yilin Cheng, Zhenxiang Wang, Xiaotian Yu, Zhi-Ming Yao, Yugui School of Physical Science and Technology Southwest University Chongqing400715 China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement MOE Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China University of Wollongong Wollongong2500 Australia

Recently, the real topology has been attracting widespread interest in two dimensions (2D). Here, based on first-principles calculations and theoretical analysis, we reveal the monolayer Cr2Se2O (ML-CrSeO) as the first material example of a 2D antiferromagnetic (AFM) real Chern insulator (RCI) with topologically protected corner states. Unlike previous RCIs, we find that the real topology of the ML-CrSeO is rooted in one certain mirror subsystem of the two spin channels, and can not be directly obtained from all the valence bands in each spin channel as commonly believed. In particular, due to antiferromagnetism, the corner modes in ML-CrSeO exhibit strong corner-contrasted spin polarization, leading to spin-corner coupling (SCC). This SCC enables a direct connection between spin space and real space. Consequently, large and switchable net magnetization can be induced in the ML-CrSeO nanodisk by electrostatic means, such as potential step and in-plane electric field, and the corresponding magnetoelectric responses behave like a sign function, distinguished from that of the conventional multiferroic materials. Our work considerably broadens the candidate range of RCI materials, and opens up a new direction for topo-spintronics and 2D AFM materials research. © 2023, CC BY.

关键词： Monolayers

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Crystal Symmetry Selected Pure Spin Photocurrent in Altermagnetic Insulators

arXiv

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arXiv 2024年

作者： Dong, Ruizhi Cao, Ranquan Tan, Dian Fei, Ruixiang School of Physics Beijing Institute of Technology Beijing100081 China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education Beijing Institute of Technology Beijing100081 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China

The generation of time-reversal-odd spin-current in metallic altermagnets has attracted considerable interest in spintronics. However, producing pure spin-current in insulating materials remains both challenging and desirable, as insulating states are frequently found in antiferromagnets. Nonlinear photogalvanic effects offer a promising method for generating spin-current in insulators. We here revealed that spin and charge photocurrents in altermagnets are protected by spin point group symmetry. Unlike the photocurrents in parity-time symmetric materials, where spin-orbit coupling (SOC) induces a significant charge current, the spin-current in altermagnets can exist as a pure spin current along specific crystal directions regardless of SOC. We applied our predictions using first-principles calculations to several distinct materials, including wurtzite MnTe and multiferroic BiFeO3. Additionally, we elucidated the previously overlooked linear-inject-current mechanism in BiFeO3 induced by SOC, which may account for the enhanced bulk photovotaic effect in multiferroics. © 2024, CC BY.

关键词： Crystal symmetry

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Excitonic instability and electronic properties of AlSb in the two-dimensional limit

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Physical Review B 2021年第8期104卷 085133-085133页

作者： Shan Dong Yuanchang Li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China

Motivated by the recent synthesis of two-dimensional monolayer AlSb, we theoretically investigate its ground-state and electronic properties using the first-principles calculations coupled with Bethe-Salpeter equation. An excitonic instability is revealed as a result of larger exciton binding energy than the corresponding one-electron energy gap by ∼0.1 eV, which is indicative of a many-body ground state accompanied by spontaneous exciton generation. Spin-orbit coupling is proven to play a vital role in the prediction of the ground state. At room temperature, the two-dimensional monolayer AlSb is expected to transform into a direct gap semiconductor with phonon-limited electron and hole mobilities both around 1700 cm2/Vs. These results show that monolayer AlSb may provide a promising platform for realization of the excitonic insulator and for applications in the next-generation electronic devices.

关键词： Electronic structure Excitons Honeycomb lattice First-principles calculations

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First- and second-order magneto-optical effects and intrinsically anomalous transport in the two-dimensional van der Waals layered magnets CrXY (X=S,Se,Te;Y=Cl,Br,I)

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Physical Review B 2022年第5期106卷 054408-054408页

作者： Xiuxian Yang Ping Yang Xiaodong Zhou Wanxiang Feng Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Kunming Institute of Physics Kunming 650223 China

Recently, the two-dimensional magnetic semiconductor CrSBr has attracted considerable attention due to its excellent air-stable property and high magnetic critical temperature. Here, we systematically investigate the electronic structure, magnetocrystalline anisotropy energy, first-order magneto-optical effects (Kerr and Faraday effects), and second-order magneto-optical effects (Schäfer-Hubert and Voigt effects) as well as intrinsically anomalous transport properties (anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects) of two-dimensional van der Waals layered magnets CrXY (X=S,Se,Te;Y=Cl,Br,I) by using first-principles calculations. Our results show that monolayer and bilayer CrXY (X=S,Se) are narrow-band-gap semiconductors, whereas monolayer and bilayer CrTeY are multiband metals. The magnetic ground states of bilayer CrXY and the easy magnetization axis of monolayer and bilayer CrXY are confirmed by the magnetocrystalline anisotropy energy calculations. Utilizing magnetic group theory analysis, the first-order magneto-optical effects as well as anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects are identified to exist in a ferromagnetic state with out-of-plane magnetization. The second-order magneto-optical effects are not restricted by the above symmetry requirements, and therefore they can arise in ferromagnetic and antiferromagnetic states with in-plane magnetization. The calculated results are compared with the available theoretical and experimental data of other two-dimensional magnets and some conventional ferromagnets. The present work reveals that monolayer and bilayer CrXY with superior magneto-optical responses and anomalous transport properties provide an excellent material platform for the promising applications of magneto-optical devices, spintronics, and spin caloritronics.

关键词： Anomalous Hall effect First-principles calculations Magnetism Magneto-optical Kerr effect 2-dimensional systems

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