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Observation of Integer and Fractional Quantum Anomalous Hall Effects in Twisted Bilayer MoTe2

Physical Review X 2023年第3期13卷 031037-031037页

作者： Fan Xu Zheng Sun Tongtong Jia Chang Liu Cheng Xu Chushan Li Yu Gu Kenji Watanabe Takashi Taniguchi Bingbing Tong Jinfeng Jia Zhiwen Shi Shengwei Jiang Yang Zhang Xiaoxue Liu Tingxin Li Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 201210 China Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics Tsinghua University 100084 Beijing China Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hefei National Laboratory Hefei 230088 China Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee Knoxville Tennessee 37996 USA

The interplay between strong correlations and topology can lead to the emergence of intriguing quantum states of matter. One well-known example is the fractional quantum Hall effect, where exotic electron fluids with fractionally charged excitations form in partially filled Landau levels. The emergence of topological moiré flat bands provides exciting opportunities to realize the lattice analogs of both the integer and fractional quantum Hall effects without the need for an external magnetic field. These effects are known as the integer and fractional quantum anomalous Hall (IQAH and FQAH) effects. Here, we present direct transport evidence of the existence of both IQAH and FQAH effects in small-angle-twisted bilayer MoTe2. At zero magnetic field, we observe well-quantized Hall resistance of h/e2 around moiré filling factor ν=−1 (corresponding to one hole per moiré unit cell), and nearly quantized Hall resistance of 3h/2e2 around ν=−2/3, respectively. Concomitantly, the longitudinal resistance exhibits distinct minima around ν=−1 and −2/3. The application of an electric field induces topological quantum phase transition from the IQAH state to a charge transfer insulator at ν=−1, and from the FQAH state to a topologically trivial correlated insulator, further transitioning to a metallic state at ν=−2/3. Our study paves the way for the investigation of fractionally charged excitations and anyonic statistics at zero magnetic field based on semiconductor moiré materials.

关键词： Magnetism Phase transitions Topological materials

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In Situ Tem Examination of Helium Cavity Evolution and Recrystallization in Am Refractory Alloys

SSRN

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SSRN 2024年

作者： Lang, Eric J. Cunningham, W. Streit Tyler, Schuyler McCue, Ian D. Trelewicz, Jason R. Hattar, Khalid Nuclear Engineering Department University of New Mexico AlbuquerqueNM United States Materials Department University of California Santa Barbara Santa BarbaraCA United States Department of Materials Science and Chemical Engineering Stony Brook University Stony BrookNY United States Materials Science and Engineering Department Northwestern University EvanstonIL United States Institute of Advanced Computational Science Stony Brook University Stony BrookNY United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Nuclear Engineering Department University of Tennessee – Knoxville KnoxvilleTN United States Sandia National Laboratories Albuquerque United States Johns Hopkins University Applied Physics Laboratory United States

In a fusion reactor environment, plasma-facing materials will be exposed to high fluxes of low energy helium ions causing rapid accumulation of He impurities that enhance surface erosion rates and hydrogen isotope retention. Tungsten-based materials, including tungsten heavy alloys and dispersion-strengthened tungsten, have been proposed to address the limitations of pure tungsten under the fusion environment, especially in the divertor region where the high surface heat fluxes are expected to drive tungsten beyond its recrystallization point. Tungsten-based materials fabricated via laser additive manufacturing (AM) techniques offer a bottom-up pathway for materials design with near-net shape through tailoring of geometry and microstructure. This work explores the response of laser AM tungsten-based materials – tungsten (W), tungsten-nickel-iron alloy (WNiFe), and tungsten-nickel-iron-zirconium carbide composite (WNiFe+ZrC) – 10 keV He implantation and in situ TEM annealing to examine helium cavity behavior in the different AM microstructures. Preferential accumulation of He cavities in Ni and Fe rich regions at interfaces leads to material degradation, as NiFe additions increase the size of He cavities when annealed at 950 °C. Evidence of in situ migration and coalescence as a function of annealing temperature and composition in the material is presented. Finally, recrystallization of W upon annealing is observed due to activated sintering and residual stress contributions. These first investigations of the in situ behavior of He cavities in laser AM tungsten-based materials demonstrate the detrimental effects of NiFe alloying on He cavity-induced swelling and microstructural stability, which inform compositional and microstructural tailoring in future W-based plasma-facing materials design. © 2024, The Authors. All rights reserved.

关键词： Additives

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Quantum Oscillations Evidence for Topological Bands in Kagome Metal ScV6Sn6

arXiv

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arXiv 2024年

作者： Zheng, Guoxin Zhu, Yuan Mozaffari, Shirin Mao, Ning Chen, Kuan-Wen Jenkins, Kaila Zhang, Dechen Chan, Aaron Arachchige, Hasitha W Suriya Madhogaria, Richa P. Cothrine, Matthew Meier, William R. Zhang, Yang Mandrus, David Li, Lu Department of Physics University of Michigan Ann ArborMI48109 United States Materials Science and Engineering Department University of Tennessee Knoxville KnoxvilleTN37996 United States Max Planck Institute for Chemical Physics of Solids Dresden01187 Germany Department of Physics and Astronomy University of Tennessee Knoxville KnoxvilleTN37996 United States Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States

Metals with kagome lattice provide bulk materials to host both the flat-band and Dirac electronic dispersions. A new family of kagome metals is recently discovered in AV6Sn6. The Dirac electronic structures of this material needs more experimental evidence to confirm. In the manuscript, we investigate this problem by resolving the quantum oscillations in both electrical transport and magnetization in ScV6Sn6. The revealed orbits are consistent with the electronic band structure models. Furthermore, the Berry phase of a dominating orbit is revealed to be around π, providing direct evidence for the topological band structure, which is consistent with calculations. Our results demonstrate a rich physics and shed light on the correlated topological ground state of this kagome metal. © 2024, CC BY-NC-ND.

关键词： Fermi surface

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Terahertz Circular Dichroism Imaging System

Terahertz Circular Dichroism Imaging System

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Takumi Yoichi Uina Chiba Takashige Omatsu Takeo Minari Seigo Ohno Katsuhiko Miyamoto Graduate School of Engineering Chiba University Chiba Japan Molecular Chirality Research Center Chiba University Chiba Japan Research Center for Functional Materials National Institute for Materials Science Ibaraki Japan Department of Physics Tohoku University Sendai Japan

We demonstrate a terahertz circular dichroism imaging system. This system allows the identification of left- and right-handed polarization singularities, associated from local left-and right-handed chiral structures, ... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Terahertz wave imaging Lasers and electrooptics Metasurfaces Electro-optical waveguides Periodic structures

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Fatigue-free ferroelectricity in Hf0.5Zr0.5O2 ultrathin films via interfacial design

arXiv

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arXiv 2025年

作者： Zhou, Chao Feng, Yanpeng Ma, Liyang Huang, Haoliang Si, Yangyang Wang, Hailin Huang, Sizhe Li, Jingxuan Kuo, Chang-Yang Das, Sujit Tang, Yunlong Liu, Shi Chen, Zuhuang State Key Laboratory of Advanced Welding Joining of Materials and Structures School of Materials Science and Engineering Harbin Institute of Technology Shenzhen518055 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Wenhua Road 72 Shenyang110016 China Key Laboratory for Quantum Materials of Zhejiang Province Department of Physics School of Science Westlake University Zhejiang Hangzhou310024 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen518045 China Department of Electrophysics National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Material Research Centre Indian Institute of Science Bangalore560012 India School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China

Due to traits of CMOS compatibility and scalability, HfO2-based ferroelectrics are promising candidates for next-generation memory devices. However, their commercialization has been greatly hindered by reliability issues, with fatigue being a major impediment. We report the fatigue-free behavior in interface-designed Hf0.5Zr0.5O2-based heterostructures. A coherent CeO2-x/Hf0.5Zr0.5O2 heterointerface is constructed, wherein CeO2-x acts as an "oxygen sponge", capable of reversibly accepting and releasing oxygen vacancies. This design effectively alleviates defect aggregation at the electrode-ferroelectric interface, enabling improved switching characteristics. Further, a symmetric capacitor architecture is designed to minimize the imprint, thereby suppressing the cycling-induced oriented defect drift. The two-pronged technique mitigates oxygen-voltammetry-generated chemical/energy fluctuations, suppressing the formation of paraelectric phase and polarization degradation. The design ensures a fatigue-free feature exceeding 1011 switching cycles and an endurance lifetime surpassing 1012 cycles for Hf0.5Zr0.5O2-based capacitors, along with excellent temperature stability and retention. These findings pave the way for developing ultra-stable hafnia-based ferroelectric devices. Copyright © 2025, The Authors. All rights reserved.

关键词： Ultrathin films

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Multiferroicity in plastically deformed SrTiO3

arXiv

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arXiv 2023年

作者： Wang, Xi Kundu, Anirban Xu, Bochao Hameed, Sajna Sochnikov, Ilya Pelc, Damjan Greven, Martin Klein, Avraham Kalisky, Beena Department of Physics Bar-Ilan University Ramat Gan52900 Israel Institute of Nanotechnology & Advanced Materials Bar-Ilan University Ramat Gan52900 Israel Physics Department Ariel University Ariel40700 Israel Department of Physics University of Connecticut StorrsCT06269 United States School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Institute of Materials Science University of Connecticut StorrsCT United States Materials Science and Engineering Department University of Connecticut StorrsCT United States Department of Physics Faculty of Science University of Zagreb ZagrebHR-10000 Croatia

A major challenge in the development of quantum technologies is to induce additional types of ferroic orders into materials that exhibit other useful quantum properties. Various techniques have been applied to this end, such as elastically straining, doping, or interfacing a compound with other materials. Plastic deformation introduces permanent topological defects and large local strains into a material, which can give rise to qualitatively new functionality. Here we show via local magnetic imaging that plastic deformation induces robust magnetism in the quantum paraelectric SrTiO3, in both conducting and insulating samples. Our analysis indicates that the magnetic order is localized along dislocation walls and coexists with polar order along the walls. The magnetic signals can be switched on and off in a controllable manner with external stress, which demonstrates that plastically deformed SrTiO3 is a quantum multiferroic. These results establish plastic deformation as a versatile platform for quantum materials engineering. © 2023, CC BY.

关键词： Plastic deformation

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Dual-symmetry-perturbed all-dielectric resonant metasurfaces for high-Q perfect light absorption

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Chinese Optics Letters 2024年第2期22卷 200-206页

作者：葛俊洋高一骁徐雷周宁沈祥 Laboratory of Infrared Materials and Devices Research Institute of Advanced TechnologiesNingbo UniversityNingbo 315211China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo 315211China Advanced Optics&Photonics Laboratory Department of EngineeringSchool of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK School of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Ningbo Institute of Oceanography Ningbo 315832China

We demonstrate a high-Q perfect light absorber based on all-dielectric doubly-resonant *** bound states in the continuum(BICs)protected by different symmetries,we manage to independently manipulate the Q factors of the two degenerate quasi-BICs through dual-symmetry perturbations,achieving precise matching of the radiative and nonradiative Q factors for degenerate critical *** achieve a narrowband light absorption with a>600 Q factor and a>99%absorptance atλ_(0)=1550 nm on an asymmetric germanium metasurface with a 0.2λ_(0)*** work provides a new strategy for engineering multiresonant metasurfaces for narrowband light absorption and nonlinear applications.

关键词： resonant metasurface perfect light absorption bound states in the continuum

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Corrigendum to “Time-course concentration of ethanol, acetaldehyde and acetate in rat brain dialysate following alcohol self-administration” [Alcohol 123 (2025) 69–76]

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Alcohol 2025年 125卷 53-54页

作者： Tse-Ang Lee Hongjoo J. Lee Regina A. Mangieri Rueben Gonzales Heba Ajmal Tanya Hutter Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Psychology The University of Texas at Austin Austin TX 78712 USA College of Pharmacy Division of Pharmacology and Toxicology The University of Texas at Austin Austin TX 78712 USA Department of Neuroscience The University of Texas at Austin Austin TX 78712 USA Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

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Substitutional oxygen activated photoluminescence enhancement in monolayer transition metal dichalcogenides

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science China materials 2022年第4期65卷 1034-1041页

作者： Shilong Zhao Junyang Tan Chengxuan Ke Simin Feng Yongjue Lai Baofu Ding Guangfu Luo Junhao Lin Bilu Liu Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute and Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Department of Physics Southern University of Science and TechnologyShenzhen518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen518055China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen518055China

Atomically thin transition metal dichalcogenides(TMDCs)are intriguing semiconductors for photonics and optoelectronics,and therefore enhancing their photoluminescence(PL)efficiency is crucial for these *** efforts have been contributed to enhancing the PL performance of monolayer TMDCs,yet the complexity between the microstructure and the PL efficiency has hindered the manipulation of their PL *** we demonstrate that the PL intensity of the monolayer TMDC can be enhanced by nearly one order of magnitude with a~20%narrower spectral linewidth after a pre-activation plateau using laser irradiation in ambient *** experimental and theoretical studies reveal that low-power laser irradiation generates many sulfur vacancy clusters,which are subsequently filled up by oxygen,and the lattice substitutional oxygen clusters induce the dramatic PL enhancement of monolayer WS;.Such PL enhancement phenomenon is found to be universal for other monolayer TMDCs,and thus would benefit their versatile optical applications.

关键词： two-dimensional materials transition metal dichalcogenides photoluminescence enhancement laser oxygen

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Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications

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ACS Nano 2023年第12期17卷 11087-11219页

作者： Choi, Dongwhi Lee, Younghoon Lin, Zong-Hong Cho, Sumin Kim, Miso Ao, Chi Kit Soh, Siowling Sohn, Changwan Jeong, Chang Kyu Lee, Jeongwan Lee, Minbaek Lee, Seungah Ryu, Jungho Parashar, Parag Cho, Yujang Ahn, Jaewan Kim, Il-Doo Jiang, Feng Lee, Pooi See Khandelwal, Gaurav Kim, Sang-Jae Kim, Hyun Soo Song, Hyun-Cheol Kim, Minje Nah, Junghyo Kim, Wook Menge, Habtamu Gebeyehu Park, Yong Tae Xu, Wei Hao, Jianhua Park, Hyosik Lee, Ju-Hyuck Lee, Dong-Min Kim, Sang-Woo Park, Ji Young Zhang, Haixia Zi, Yunlong Guo, Ru Cheng, Jia Yang, Ze Xie, Yannan Lee, Sangmin Chung, Jihoon Oh, Il-Kwon Kim, Ji-Seok Cheng, Tinghai Gao, Qi Cheng, Gang Gu, Guangqin Shim, Minseob Jung, Jeehoon Yun, Changwoo Zhang, Chi Liu, Guoxu Chen, Yufeng Kim, Suhan Chen, Xiangyu Hu, Jun Pu, Xiong Guo, Zi Hao Wang, Xudong Chen, Jun Xiao, Xiao Xie, Xing Jarin, Mourin Zhang, Hulin Lai, Ying-Chih He, Tianyiyi Kim, Hakjeong Park, Inkyu Ahn, Junseong Huynh, Nghia Dinh Yang, Ya Wang, Zhong Lin Baik, Jeong Min Choi, Dukhyun Kyung Hee University Gyeonggi Yongin17104 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Mechanical Engineering Soft Robotics Research Center Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon16419 Korea Republic of Sungkyunkwan University 2066 Seobu-ro Gyeonggi Suwon16419 Korea Republic of Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Division of Advanced Materials Engineering Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Department of Physics Inha University 100 Inha-ro Incheon22212 Korea Republic of School of Materials Science & Engineering Yeungnam University Gyeongbuk Gyeongsan38541 Korea Republic of 291 Daehak-ro Daejeon34141 Korea Republic of School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Flexible Electronics Technology of Tsinghua Zhejiang Jiaxing314000 China Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju632-43 Korea Republic of School of Engineering University of Glasgow GlasgowG128QQ United Kingdom Seoul02792 Korea Republic of Department of Physics Inha University Incheon22212 Korea Republic of Suwon16419 Korea Republic of Department of

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade. © 2023 The Authors. Published by American Chemical Society

关键词： Nanogenerators

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