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Orbital-Ordering Driven Simultaneous Tunability of Magnetism and Electric Polarization in Strained Monolayer VCl_(3)

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Chinese Physics Letters 2024年第4期41卷 126-131页

作者：郭的坪王聪王侣锦陆赟豪吴骅张妍宁季威 Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Laboratory for Computational Physical Sciences(MOE) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Two-dimensional(2D)van der Waals magnetic materials have promising and versatile electronic and magnetic properties in the 2D limit,indicating a considerable potential to advance spintronic *** predictions thus far have not ascertained whether monolayer VCl_(3) is a ferromagnetic(FM)or anti-FM monolayer;this also remains to be experimentally *** theoretically investigate the influence of potential factors,including C_(3) symmetry breaking,orbital ordering,epitaxial strain,and charge doping,on the magnetic ground *** first-principles calculations,we predict a collinear type-Ⅲ FM ground state in monolayer VCl_(3) with a broken C_(3) symmetry,wherein only the former two of three t_(2g)orbitals(a_(1g),e_(g2)^(π)and e_(g1)^(π))are *** atomic layer thickness and bond angles of monolayer VCl_(3) undergo abrupt changes driven by an orbital ordering switch,resulting in concomitant structural and magnetic phase *** doping to the underlying Cl atoms of monolayer VCl_(3) without C_(3) symmetry simultaneously induces in-and out-of-plane *** can achieve a multiferroic phase transition if combined with the discovered adjustments of magnetic ground state and polarization magnitude under *** establishment of an orbital-ordering driven regulatory mechanism can facilitate deeper exploration and comprehension of magnetic properties of strongly correlated systems in monolayer VCl_(3).

关键词： monolayer symmetry orbital

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Midgap states induced by Zeeman field and p-wave superconductor pairing

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Physical Review B 2024年第24期109卷 L241101-L241101页

作者： Yuanjun Jin XingYu Yue Yong Xu Xiang-Long Yu Guoqing Chang Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics Division of Physics and Applied Physics School of Physical and Mathematical Sciences Physics Department and Guangdong-Hong Kong Joint Laboratory of Quantum Matter the Institute of Micro/Nano Materials and Devices Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China

The one-dimensional Su-Schrieffer-Heeger (SSH) model is central to band topology in condensed matter physics, which allows us to understand and design distinct topological states. In this work we find another mechanism to analogize the SSH model in a spinful system, realizing an obstructed atomic insulator by introducing intrinsic spin-orbit coupling and in-plane Zeeman field. In our model the midgap states originate from a quantized hidden polarization with invariant index Z2 (0; 01) due to the local inversion symmetry breaking. When the global inversion symmetry is broken, a charge pumping is designed by tuning the polarization. Moreover, by introducing the p+ip superconductor pairing potential, a topological phase dubbed obstructed superconductor (OSC) is identified. This new state is characterized by invariant index Z2 (0; 01) and nonchiral midgap states. More interestingly, these nonchiral edge states result in a chiral-like nonlocal conductance, which is different from the traditional chiral topological superconductor. Our findings not only find another strategy to achieve a spinful SSH model but also predict the existence of OSC, providing a promising avenue for further exploration of its transport properties.

关键词： 2-dimensional systems Electronic structure Node-line semimetals Topological insulators Topological materials Topological superconductors

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Spin transport of half-metal Mn_(2)X_(3) with high Curie temperature:An ideal giant magnetoresistance device from electrical and thermal drives

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Frontiers of physics 2024年第4期19卷 125-135页

作者： Bin Liu Xiaolin Zhang Jingxian Xiong Xiuyang Pang Sheng Liu Zixin Yang Qiang Yu Honggen Li Sicong Zhu Jian Wu Hubei Province Key Laboratory of Systems Science in Metallurgical Process The State Key Laboratory for Refractories and MetallurgyCollaborative Innovation Center for Advanced SteelsInternational Research Institute for Steel TechnologyWuhan University of Science and TechnologyWuhan 430081China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physical and Technology Wuhan UniversityWuhan 430072China College of Advanced Interdisciplinary Studies Nanhu Laser LaboratoryNational University of Defense TechnologyChangsha 410073China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore i-Lab&Key Laboratory of Nanodevices and Applications&Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and NanoBionicsChinese Academy of SciencesSuzhou 215123China Institute of Optical Science and Technology School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

Currently,magnetic storage devices are encountering the problem of achieving lightweight and high integration in mobile computing devices during the information *** a result,there is a growing urgency for twodimensional half-metallic materials with a high Curie temperature(TC).This study presents a theoretical investigation of the fundamental electromagnetic properties of the monolayer hexagonal lattice of Mn_(2)X_(3)(X=S,Se,Te).Additionally,the potential application of Mn_(2)X_(3) as magneto-resistive components is *** three of them fall into the category of ferromagnetic *** particular,the Monte Carlo simulations indicate that the TC of Mn2S3 reachs 381 K,noticeably greater than room *** findings present notable advantages for the application of Mn2S3 in spintronic ***,a prominent spin filtering effect is apparent when employing non-equilibrium Green’s function simulations to examine the transport *** resulting current magnitude is approximately 2×10^(4) nA,while the peak gigantic magnetoresistance exhibits a substantial value of 8.36×10^(16)%.It is noteworthy that the device demonstrates a substantial spin Seebeck effect when the temperature differential between the electrodes is *** brief,Mn_(2)X_(3) exhibits outstanding features as a highTC half-metal,exhibiting exceptional capabilities in electrical and thermal drives spin ***,it holds great potential for usage in spintronics applications.

关键词： half-metals Mn_(2)X_(3) high Curie temperature electrical and thermal GMR

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Tuning the Mottness in Sr_(3)Ir_(2)O_(7)via Bridging Oxygen Vacancies

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Chinese Physics Letters 2023年第3期40卷 25-30页

作者：徐妙邹昌炜龚本超贾可叶树森郝镇齐刘凯石友国卢仲毅蔡鹏王亚愚 State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Frontier Science Center for Quantum Information Beijing 100084China

The electronic evolution of Mott insulators into exotic correlated phases remains puzzling,because of electron interaction and *** of individual imperfections in Mott insulators could help capture the main mechanism and serve as a basis to understand the *** we utilize scanning tunneling microscopy to probe the atomic scale electronic structure of the spin-orbit-coupling assisted Mott insulator Sr_(3)Ir_(2)O_(7).It is found that the tunneling spectra exhibit a homogeneous Mott gap in defect-free regions,but near the oxygen vacancy in the rotated Ir O_(2)plane the local Mott gap size is significantly *** attribute the enhanced gap to the locally reduced hopping integral between the 5d electrons of neighboring Ir sites via the bridging planar oxygen p *** bridging defects have a dramatic influence on local bandwidth,thus provide a new way to manipulate the strength of Mottness in a Mott insulator.

关键词： bridging tunneling utilize

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Magnetoresistance anomaly in Fe_(5)GeTe_(2)homo-junctions induced by its intrinsic transition

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nano Research 2023年第7期16卷 10443-10450页

作者： Ruijie Zhao Yanfei Wu Shaohua Yan Xinjie Liu He Huang Yang Gao Mengyuan Zhu Jianxin Shen Shipeng Shen Weifeng Xu Zeyu Zhang Liyuan Zhang Jingyan Zhang Xinqi Zheng Hechang Lei Ying Zhang Shouguo Wang School of Materials Science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China School of Materials Science and Engineering Anhui UniversityHefei 230601China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Two-dimensional van der Waals(2D vdW)magnets have attracted great attention recently and possess the unprecedented advantages of incorporating high-quality vdW heterostructures and homostructures into spintronic devices,and exploring various physical phenomena or *** them,Fe_(5)GeTe_(2)(F5GT)has ferromagnetic order close to room temperature,however the magnetic properties near its intrinsic transitions and F5GT-based 2D devices remain mostly ***,we systematically demonstrate the peculiar magnetic properties of Fe_(5)GeTe_(2)nanoflakes near its intrinsic transition temperature(Tp)which is far lower than its Curie temperature(TC)of~265 K,and firstly discover anomalous magnetoresistance effect in F5GT homo-junctions by magneto-transport *** strongest anomalous Hall effect occurs around Tp which is located in a temperature range from 130 to 160 K for the F5GT nanoflakes with different ***,negative magnetoresistance(N-MR)and butterfly-shaped magnetoresistance(B-MR)are observed in F5GT homo-junction devices,and they appeared only in an intermediate temperature range from 110 to 160 K,noticeably showing the maxima near the T_(p)rather than the lowest *** experimental results clearly reveal the significant influence of intrinsic transitions on magnetic properties of F5GT and magnetoresistance effect in F5GT homo-junction devices,which imply a new strategy to achieve highperformance 2D spintronic devices by tuning intrinsic magnetic or structural transitions in 2D vdW magnets.

关键词： Two-dimensional(2D)van der Waals magnets Fe_(5)GeTe_(2) homo-junction magnetoresistance

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Quantum walks of correlated photons in non-Hermitian photonic lattices

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Physical Review B 2024年第9期110卷 094308页

作者： Mingyuan Gao Chong Sheng Yule Zhao Runqiu He Liangliang Lu Wei Chen Kun Ding Shining Zhu Hui Liu National Laboratory of Solid State Microstructures and School of Physics Collaborative Innovation Center of Advanced Microstructures Key Laboratory of Quantum Materials and Devices Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and Technology Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education)

Entanglement entropy characterizes the correlation of multiparticles and unveils the crucial features of open quantum systems. However, the experimental realization of exploring entanglement in non-Hermitian systems remains a challenge. In parallel, quantum walks have offered the possibility of studying the underlying mechanisms of non-Hermitian physics, which includes exceptional points, the non-Hermitian skin effect, and non-Bloch phase transitions. Unfortunately, these studies have only involved and prevailingly focused on the behavior of a single particle. Here, we propose and experimentally realize quantum walks of two indistinguishable photons in engineered non-Hermitian photonic lattices. We have successfully observed the unidirectional behavior of quantum walks in the bulk far from the edges induced by the skin effect. Moreover, we experimentally reveal the suppression of entanglement that is caused by the skin effect in non-Hermitian systems. Our study may facilitate a deep understanding of entanglement in open quantum many-body systems that are far from thermal equilibrium.

关键词： Photonics Skin effect Non-Hermitian systems Transfer matrix method

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A Novel Multiple Modes Resonant Sensor Featuring Blue Sideband Excitation 38

A Novel Multiple Modes Resonant Sensor Featuring Blue Sideba...

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38th IEEE International Conference on micro Electro Mechanical Systems, MEMS 2025

作者： Xu, Jiao Zheng, Zhuoyue Xi, Jingqian Zhang, Ziqian Liu, Huafeng Zhang, Pan Chen, Jianlin Wang, Chen Kraft, Michael Wang, Yuan Martins, R.P. Mak, Pui-In Huazhong University of Science and Technology Moe Key Laboratory of Fundamental Physical Quantities Measurement Pgmf School of Physics Wuhan430074 China University of Macau Institute of Microelectronics State Key Laboratory of Analog and Mixed-Signal Vlsi 999078 China Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits 100871 China Shanghai University School of Microelectronics 200444 China Ku Leuven Department of Electrical Engineering-MNS Leuven3000 Belgium

ISBN: (纸本)9798331508890

This paper reports a novel MEMS resonant structure functioning as a baseline resonant electrostatic force/temperature sensor, highlighting its substantial potential in sensing applications. The resonator, characterized by a dual-cosine structure, is capable of simultaneous multiple resonant modes actuation within the 300 kHz range, through a sole-source drive approach using the recent emerging Blue Sideband Excitation (BSE) technique. This method enables a distinctive multi-modal response, essential for multi-parameter measurements. The research focuses on the sensor's temperature characteristics, electrostatic perturbation sensitivity, and noise floor. Notably, the study reveals intriguing temperature responses across different modes, where certain modes exhibit a significant frequency rise with increasing temperature, this is counter-intuitive with common MEMS resonator devices, prompting further investigation into the underlying mechanisms. The analysis of electrostatic perturbation sensitivity and noise background further unfolds the resonator's performance under various excitation conditions, laying a foundation for advancing sensor functionality, and providing solid evidence on the viability of the subject. To sum up, this study highlights the resonator's potential as a high-precision sensor, opening new opportunities for MEMS sensor design and multi-parameter measurement applications. © 2025 IEEE.

关键词： microchannels

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Tunable unconventional integer quantum Hall effect in two-dimensional Dirac-Weyl systems

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Physical Review B 2024年第8期109卷 L081404-L081404页

作者： Y. J. Jin Y. Xu X. L. Xiao Z. J. Chen H. Xu Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics South China Normal University Guangzhou 510006 China Department of Physics & Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 People's Republic of China Institute of Micro/Nano Materials and Devices Ningbo University of Technology Ningbo 315016 Zhejiang People's Republic of China Department of Physics Chongqing University Chongqing 400044 People's Republic of China Songshan Lake Materials Laboratory Dongguan 523808 People's Republic of China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 People's Republic of China

Two-dimensional (2D) Dirac semimetals possess intriguing properties due to their low-energy excitations behaving like Dirac fermions. A hallmark of these materials is the unconventional integer quantum Hall effect (IQHE), originating from the quantized Berry phase of Dirac fermions. Herein, using symmetry analysis, tight-binding models, and numerical calculations, we reveal 2D Dirac-Weyl fermions in inversion symmetry breaking systems that exhibit tunable unconventional IQHE. These unique 2D fermions are characterized by a pair of helical edge states related by time-reversal symmetry T, which connect the projections of a Dirac point and two separate Weyl nodes, indicating that the Dirac and Weyl points are interconnected as a whole. We show that these 2D Dirac-Weyl fermions exhibit a tunable unconventional IQHE, featuring a Hall plateau sequence shifted by three units of 2e2h. The distance between adjacent quantized Hall plateaus can be adjusted by strain, which is a unique feature that distinguishes from what is observed in graphene. Through first-principles calculations, we identify an ideal candidate material for hosting 2D Dirac-Weyl fermions, offering a promising avenue for experimental verification. Our findings open up a door to exploring unconventional IQHE in condensed-matter systems beyond graphene.

关键词： Integer quantum Hall effect Landau levels Symmetry protected topological states Tight-binding model k dot p method

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Rational design on high-performance triboelectric nanogenerator consisting of silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite films

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Discover nano 2023年第1期18卷 1-12页

作者： Zhao, Kun Sun, Wanru Li, Suixin Song, Zhenhua Zhong, Ming Zhang, Ding Gu, Bing-Ni Liu, Ming-Jin Fu, Hao Liu, Hongjie Meng, Cheng Chueh, Yu-Lun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin300350 China Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Colleage of Semiconductor Research National Tsing-Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of Chemistry Biology and Materials Science East China University of Technology Nanchang330013 China

The relatively low output performance of triboelectric nanogenerator (TENG), which faces a challenge in performance improvement, limits its practical applications. Here, a high-performance TENG consisting of a silicon carbide@silicon dioxide nanowhiskers/polydimethylsiloxane (SiC@SiO2/PDMS) nanocomposite film and a superhydrophobic aluminum (Al) plate as triboelectric layers is demonstrated. The 7 wt% SiC@SiO2/PDMS TENG presents a peak voltage of 200 V and a peak current of 30 μA, which are ~ 300 and ~ 500% over that of the PDMS TENG, owing to an increase in dielectric constant and a decrease in dielectric loss of the PDMS film because of electric insulated SiC@SiO2 nanowhiskers. Furthermore, a 10 μF capacitor can be charged up to 3 V within ~ 87 s, which can be continuously operated on the electronic watch for 14 s. The work provides an effective strategy for improving output performance of TENG by adding core–shell nanowhiskers to modulate the dielectric properties of organic materials. Graphical abstract: [Figure not available: see fulltext.] © 2023, The Author(s).

关键词： Silica

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Competing multiferroic phases in monolayer and few-layer NiI2

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Physical Review B 2024年第19期109卷 195422-195422页

作者： Nanshu Liu Cong Wang Changlin Yan Changsong Xu Jun Hu Yanning Zhang Wei Ji Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices Department of Physics Renmin University of China Beijing 100872 China Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Renmin University of China Beijing 100872 China Key Laboratory of Computational Physical Sciences (Ministry of Education) Institute of Computational Physical Sciences State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China School of Physical Science and Technology Ningbo University Ningbo 315211 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China

A recent experiment reported type-II multiferroicity in monolayer (ML) NiI2 based on a presumed spiral magnetic configuration (spiral-B), which is, as we found here, under debate in the ML limit. Freestanding ML NiI2 breaks its C3 symmetry, as it prefers a striped antiferromagnetic order (AABB-AFM) along with an intralayer antiferroelectric (AFE) order. However, substrate confinement may preserve the C3 symmetry and/or apply tensile strain to the ML. This leads to another spiral magnetic order (spiral−IVX), while bilayer shows a different order (spiral−VX) and spiral-B dominates in thicker layers. Thus, three multiferroic phases, namely, spiral-B+FE, spiral−IVX+FE, spiral−VX+FE, and an antimultiferroic AABB-AFM+AFE one, show layer thickness dependence and geometry-dependent dominance, ascribed to competition among thickness-dependent Kitaev, biquadratic, and Heisenberg spin-exchange interactions and single-ion magnetic anisotropy. Our theoretical results clarify the debate on the multiferroicity of ML NiI2 and shed light on the role of layer stacking induced changes in noncollinear spin-exchange interactions and magnetic anisotropy in thickness-dependent magnetism.

关键词： Ferroelectricity Magnetic interactions 2-dimensional systems Multiferroics Density functional theory

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