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arXiv 2024年

作者： Acharya, Gokul Neupane, Bimal Hsu, Chia-Hsiu Yang, Xian P. Graf, David Choi, Eun Sang Pandey, Krishna Un Nabi, Md Rafique Chhetri, Santosh Karki Basnet, Rabindra Rahman, Sumaya Wang, Jian Hu, Zhengxin Da, Bo H., Churchill G., Chang M.Z., Hasan Y., Wang J., Hu Department of Physics University of Arkansas FayettevilleAR United States Department of Physics University of North Texas DentonTX United States Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Singapore Okinawa904-0495 Japan Department of Physics Princeton University PrincetonNJ United States National High Magnetic Field Lab TallahasseeFL United States Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR United States MonArk NSF Quantum Foundry University of Arkansas FayettevilleAR United States Department of Chemistry & Physics University of Arkansas at Pine Bluff Pine BluffAR71603 United States Department of Chemistry and Biochemistry Wichita State University WichitaKS United States Ibaraki Tsukuba Japan Department of Chemistry University of Cambridge Cambridge United Kingdom Princeton Institute for Science and Technology of Materials Princeton University PrincetonNJ United States Lawrence Berkeley National Laboratory BerkeleyCA United States

Magnetotransport, the response of electrical conduction to external magnetic field, acts as an important tool to reveal fundamental concepts behind exotic phenomena and plays a key role in enabling spintronic applications. Magnetotransport is generally sensitive to magnetic field orientations. In contrast, efficient and isotropic modulation of electronic transport, which is useful in technology applications such as omnidirectional sensing, is rarely seen, especially for pristine crystals. Here we propose a strategy to realize extremely strong modulation of electron conduction by magnetic field which is independent of field direction. GdPS, a layered antiferromagnetic semiconductor with resistivity anisotropies, supports a field-driven insulator-to-metal transition with a paradoxically isotropic gigantic negative magnetoresistance insensitive to magnetic field orientations. This isotropic magnetoresistance originates from the combined effects of a near-zero spin-orbit coupling of Gd3+-based half-filling f-electron system and the strong on-site f-d exchange coupling in Gd atoms. Our results not only provide a novel material system with extraordinary magnetotransport that offers a missing block for antiferromagnet-based ultrafast and efficient spintronic devices, but also demonstrate the key ingredients for designing magnetic materials with desired transport properties for advanced functionalities. © 2024, CC BY-NC-SA.

关键词： Magnetoresistance

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Nonreciprocal transport in a bilayer of MnBi2Te4 and Pt

arXiv

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arXiv 2022年

作者： Ye, Chen Xie, Xiangnan Lv, Wenxing Huang, Ke Yang, Allen Jian Jiang, Sicong Liu, Xue Zhu, Dapeng Qiu, Xuepeng Tong, Mingyu Zhou, Tong Hsu, Chuang-Han Chang, Guoqing Lin, Hsin Li, Peisen Yang, Kesong Wang, Zhenyu Jiang, Tian Wang, Xiao Renshaw Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link 637371 Singapore State Key Laboratory of High Performance Computing College of Computer Science and Technology National University of Defense Technology Changsha410073 China Physics Laboratory Industrial Training Center Shenzhen Polytechnic Guangdong Shenzhen518055 China Department of NanoEngineering Program of Chemical Engineering University of California La Jolla San DiegoCA92093-0448 United States Program of Materials Science and Engineering University of California La Jolla San DiegoCA92093-0418 United States Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Fert Beijing Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing100191 China Beihang-Goertek Joint Microelectronics Institute Qingdao Research Institute Beihang University Qingdao266000 China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China Insitute of Physics Academia Sinica Taipei115229 Taiwan College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China National Innovation Institute of Defense Technology Academy of Military Sciences PLA China Beijing100010 China Beijing Academy of Quantum Information Sciences Beijing100084 China Beijing Institute for Advanced Study National University of Defense Technology Changsha410073 China School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Ave 639798 Singapore

MnBi2Te4 (MBT) is the first intrinsic magnetic topological insulator with the interaction of spin-momentum locked surface electrons and intrinsic magnetism, and it exhibits novel magnetic and topological phenomena. Recent studies suggested that the interaction of electrons and magnetism can be affected by the Mn-doped Bi2Te3 phase at the surface due to inevitable structural defects. Here we report an observation of nonreciprocal transport, i.e. current-direction-dependent resistance, in a bilayer composed of antiferromagnetic MBT and nonmagnetic Pt. The emergence of the nonreciprocal response below the Néel temperature confirms a correlation between nonreciprocity and intrinsic magnetism in the surface state of MBT. The angular dependence of the nonreciprocal transport indicates that nonreciprocal response originates from the asymmetry scattering of electrons at the surface of MBT mediated by magnon. Our work provides an insight into nonreciprocity arising from the correlation between magnetism and Dirac surface electrons in intrinsic magnetic topological insulators. © 2022, CC BY.

关键词： Magnetism

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Deep Denoising Neural Network Assisted Compressive Channel Estimation for mmWave Intelligent Reflecting Surfaces

arXiv

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arXiv 2020年

作者： Liu, Shicong Gao, Zhen Zhang, Jun DiRenzo, Marco Alouini, Mohamed-Slim Fellow IEEE Beijing100081 China Laboratoire des Signaux et Systèmes CNRS CentraleSupélec Univ Paris Sud Université Paris-Saclay Paris91192 France Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal23955 Saudi Arabia

into millimeter-wave (mmWave) massive multi-input-multi-ouput (MIMO) has been a promising approach for improved coverage and throughput. Most existing work assumes the ideal channel estimation, which can be challenging due to the high-dimensional cascaded MIMO channels and passive reflecting elements. Therefore, this paper proposes a deep denoising neural network assisted compressive channel estimation for mmWave IRS systems to reduce the training overhead. Specifically, we first introduce a hybrid passive/active IRS architecture, where very few receive chains are employed to estimate the uplink user-to-IRS channels. At the channel training stage, only a small proportion of elements will be successively activated to sound the partial channels. Moreover, the complete channel matrix can be reconstructed from the limited measurements based on compressive sensing, whereby the common sparsity of angular domain mmWave MIMO channels among different subcarriers is leveraged for improved accuracy. Besides, a complex-valued denoising convolution neural network (CV-DnCNN) is further proposed for enhanced performance. Simulation results demonstrate the superiority of the proposed solution over state-of-the-art solutions.—Integrating large intelligent reflecting surfaces (IRS) Copyright © 2020, The Authors. All rights reserved.

关键词： Channel estimation

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Spin-Torque-Driven Non-uniform Dynamics of an Antivortex Core in Truncated Astroid Shaped Nanomagnets

arXiv

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arXiv 2025年

作者： Aykin, Ahmet Koral Piskin, Hasan Kocaman, Bayram Yanik, Cenk Karakas, Vedat Arpaci, Sevdenur Ozbay, Aisha Gokce Carpentieri, Mario Finocchio, Giovanni Celegato, Federica Tiberto, Paola Lendinez, Sergi Novosad, Valentine Hoffmann, Axel Ozatay, Ozhan Boğaziçi University Physics Department Istanbul Turkey Boğaziçi University Mechanical Engineering Department Istanbul Turkey Department of Fundamental Sciences Faculty of Engineering Alanya Alaaddin Keykubat University Antalya07450 Turkey Siirt University Department of Electrical and Electronics Engineering Siirt Turkey Northwestern University Department of Electrical and Computer Engineering EvanstonIL United States TUBITAK National Metrology Institute UME Kocaeli Turkey Politecnico di Bari Department of Electrical & Information Engineering Bari Italy University of Messina Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences Messina Italy Torino Italy Argonne National Laboratory Materials Science Division LemontIL United States University of Illinois Urbana-Champaign Department of Materials Science and Engineering Materials Research Laboratory UrbanaIL United States SUNUM Sabanci University Nanotechnology Research and Application Center Istanbul34956 Turkey

Spin textures that are not readily available in the domain structures of continuous magnetic thin films can be stabilized when patterned to micro/nano scales due to the dominant effect of dipolar magnetic interactions. Fabrication of such devices enables a thorough study of their RF dynamics excited by highly concentrated spin-polarized/pure-spin currents. For this purpose, in this study, we have employed a truncated astroid geometry to achieve stable magnetic antivortex core nucleation/annihilation which was detectable using the anisotropic magnetoresistance (AMR) at various temperatures. Furthermore, by depositing a soft magnetic thin film (20 nm thick permalloy) capped with a heavy-metal 2nm Pt layer, we were able to probe the spin orbit torque induced excitations accompanied by self-torque due to half-antivortex cores reminiscent of an isolated-antivortex, yielding GHz frequency oscillations with high quality factors (~50000). The observed RF oscillations can be attributed to a nonuniform domain wall oscillation mode close to the stable-antivortex core nucleation site as seen in micromagnetic simulations. This fundamental study of antivortex core response to spin currents is crucial for the assessment of their potential applications in high frequency spintronic devices such as reservoir computers. © 2025, CC BY-NC-ND.

关键词： Magnetic thin films

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Noninvasive multichannel urodynamic system: Obtaining cutaneous electrical signals from the human urinary bladder

Lifestyle Medicine

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Lifestyle Medicine 2024年第1期5卷

作者： Kurniawan, Jonas F. Lee, Sanghee Le, Hoang-Kim Nguyen, Andrew K. L. Sit, Nathan L. J. Pham, Timothy Tjhia, Boris Gottlieb, Ryan Li, Carleen Shin, Andrew J. Garcia, Hassler Bueno Wu, Vincent M. Mendoza, Tris R DiPina, Thomas Ornelas, Gladys Chiang, George Jamieson, Christina A. M. Santiago-Lastra, Yahir Coleman, Todd P. Department of Bioengineering University of California San Diego La Jolla CA United States Materials Science and Engineering Program University of California San Diego La Jolla CA United States Department of Bioengineering Stanford University Stanford CA United States Department of Urology University of California San Diego La Jolla CA United States Pediatric Urology Rady Children's Hospital San Diego San Diego CA United States Department of Urology Baylor Scott & White Temple TX United States Department of Physics University of California San Diego La Jolla CA United States Department of Electrical and Computer Engineering University of California San Diego La Jolla CA United States Department of Nanoengineering University of California San Diego La Jolla CA United States Department of Materials Science and Engineering Stanford University Stanford CA United States Division of Pediatric Urology University of California San Diego La Jolla CA United States

We developed a high-resolution and noninvasive multichannel urodynamic system combined with a novel signal-processing algorithm tailored to extract electromyographic (EMG) activity from the urinary bladder. We utilized a flexible noninvasive biopotential recording system to collect an array of EMG signals from the urinary bladder of human subjects. This study also presents the use of an existing artifact rejection methodology to autonomously extract an EMG signal from an environment prone to motion artifacts. © 2023 The Authors. Lifestyle Medicine published by John Wiley & Sons Ltd.

关键词： electrical signal from the urinary bladder flexible electronics noninvasive multichannel urodynamic study voluntary voiding

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Terahertz Cavity Phonon Polaritons in the Deep-Strong Coupling Regime

Terahertz Cavity Phonon Polaritons in the Deep-Strong Coupli...

引用

International Conference on Infrared and Millimeter Waves

作者： Andrey Baydin Manukumara Manjappa Sobhan Subhra Mishra Hongjing Xu Jacques Doumani Fuyang Tay Dasom Kim Felix G. G. Hernandez Paulo H. O. Rappl Eduardo Abramof Ranjan Singh Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston TX USA Smalley-Curl Institute Rice University Houston TX USA Department of Instrumentation and Applied Physics Indian Institute of Science Bangalore India Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Physics and Astronomy Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Instituto de Física Universidade de São Paulo São Paulo SP Brazil Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais São José dos ampos SP Brazil Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore Department of Material Science and NanoEngineering Rice University Houston TX USA

We have studied the resonant and nonperturbative coupling of transverse optical phonons in lead telluride with photons in small-mode-volume terahertz cavities, observing a giant vacuum Rabi splitting on the order of the uncoupled phonon and cavity frequencies. Our terahertz time-domain spectroscopy experimental data, systematically collected as a function of sample thickness, temperature, and cavity length, can be well reproduced by our electromagnetic simulations. These results demonstrate that this uniquely tunable platform is promising for realizing and understanding predicted cavity-vacuum-induced ferroelectric instabilities, as well as for exploring applications of light-matter coupling in the ultra-and deep-strong coupling regimes in quantum technology.

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Deep-Strong Coupling between Cavity Photons and Terahertz TO Phonons in PbTe

Deep-Strong Coupling between Cavity Photons and Terahertz TO...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Andrey Baydin Manukumara Manjappa Sobhan Subhra Mishra Hongjing Xu Fuyang Tay Dasom Kim Felix G. G. Hernandez Paulo H. O. Rappl Eduardo Abramof Ranjan Singh Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas USA Smalley-Curl Institute Rice University Houston Texas USA Instrumentation and Applied Physics Department Indian Institute of Science Bangalore India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore Department of Physics and Astronomy Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Instituto de Física Universidade de São Paulo São Paulo SP Brazil Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais São José dos Campos SP Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Material Science and NanoEngineering Rice University Houston Texas USA

We have investigated the resonant coupling of photons with TO phonons in lead telluride in small-mode-volume terahertz cavities, observing a giant vacuum Rabi splitting on the order of the bare cavity–phonon frequency.

ISBN: (纸本)9781957171258

关键词： Electric fields Numerical simulation Optical constants Photons physical vapor deposition Terahertz spectroscopy

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Model predictions of wave overwash extent into the marginal ice zone

arXiv

引用

arXiv 2022年

作者： Pitt, Jordan P.A. Bennetts, Luke G. Meylan, Michael H. Massom, Robert A. Toffoli, Alessandro School of Mathematical Sciences University of Adelaide AdelaideSA5005 Australia School of Information and Physical Sciences The University of Newcastle CallaghanNSW2308 Australia Australian Antarctic Division KingstonTAS7050 Australia Australian Antarctic Program Partnership Institute for Marine and Antarctic Studies University of Tasmania HobartTAS7001 Australia The Australian Centre for Excellence in Antarctic Science University of Tasmania HobartTAS7001 Australia Department of Infrastructure Engineering University of Melbourne ParkvilleVIC3052 Australia

A model of the extent of wave driven overwash into fields of sea ice floes is proposed. The extent model builds on previous work modelling wave overwash of a single floe by regular waves by including irregular incoming waves and random floe fields. The model is validated against a laboratory experiment. It is then used to study the extent of wave overwash into marginal ice zones consisting of pancake and fragmented floe fields. The effects of wave conditions and floe geometry on predicted extents are investigated. Finally, the model is used to predict the wave overwash extent for the conditions observed during a winter (July) 2017 Antarctic voyage in which the sea surface was monitored by a stereo-camera system. Copyright © 2022, The Authors. All rights reserved.

关键词： Sea ice

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Longwave infrared dual-comb spectroscopy based on high power quantum cascade lasers

引用

Infrared Physics & Technology 2025年 150卷

作者： Ruixin Huang Yu Ma Dapeng Wu Fengmin Cheng Jinchuan Zhang Shuman Liu Shenqiang Zhai Lijun Wang Qi Jie Wang Fengqi Liu Ning Zhuo Quanyong Lu Laboratory of Solid-State Optoelectronics Information Technology Institute of Semiconductors CAS Beijing 100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Division of Quantum Materials and Devices Beijing Academy of Quantum Information Sciences Beijing 100193 China Center for OptoElectronics and Biophotonics School of Electrical & Electronic Engineering Nanyang Technological University Singapore 639798 Singapore School of Physical and Mathematical Science and Photonics Institute Nanyang Technological University Singapore 639798 Singapore

Dual-comb spectroscopy (DCS) based on quantum cascade lasers (QCLs) is of great interest to molecular spectroscopy due to its combined advantages of high temporal and spectral resolutions along with compact platform. Despite extensive current research in this exciting field, DCS using high-power longwave infrared (λ > 9 μm) QCLs is still relatively unexplored. In this work, we present a compact free-running dual-comb system consisting of λ ∼ 9.4 μm QCLs with output power over 1 W under room-temperature continuous-wave operation. High output power of QCL comb source is achieved through a tailored waveguide design that simultaneously reduces waveguide loss and optimizes group velocity dispersion (GVD). High coherence of the comb device is validated by an intermode beatnote linewidth narrow than 1 kHz and a narrow multiheterodyne comb linewidth of 15 kHz in free-running mode, recorded with an acquisition time of 25 μs. The amplitude noise of the heterodyned comb line is further investigated to assess the stability of the dual-comb spectroscopy setup. The spectroscopic functionality of the QCL DCS is further verified by GaAs etalon and NH 3 transmission spectral characterizations. The demonstrated high power QCL DCS exhibits an application potential in the applications of high-absorbing sample testing and remote sensing.

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The joint automated repository for various integrated simulations (JARVIS) for data-driven materials design

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npj Computational Materials 2020年第1期6卷 234-246页

作者： Kamal Choudhary Kevin F.Garrity Andrew C.E.Reid Brian DeCost Adam J.Biacchi Angela R.Hight Walker Zachary Trautt Jason Hattrick-Simpers A.Gilad Kusne Andrea Centrone Albert Davydov Jie Jiang Ruth Pachter Gowoon Cheon Evan Reed Ankit Agrawal Xiaofeng Qian Vinit Sharma Houlong Zhuang Sergei V.Kalinin Bobby G.Sumpter Ghanshyam Pilania Pinar Acar Subhasish Mandal Kristjan Haule David Vanderbilt Karin Rabe Francesca Tavazza Materials Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA Theiss Research La JollaCA 92037USA Department of Chemistry and Biochemistry University of MarylandCollege ParkMD 20742USA Physical Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA Materials and Manufacturing Directorate Air Force Research LaboratoryWright–Patterson Air Force BaseDaytonOH 45433USA Department of Materials Science and Engineering Stanford UniversityStanfordCA 94305USA Department of Electrical and Computer Engineering Northwestern UniversityEvanstonIL 60208USA Department of Materials Science and Engineering Texas A&M UniversityTexasTX 77843USA Joint Institute for Computational Sciences University of TennesseeKnoxvilleTN 37996USA National Institute for Computational Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA School for Engineering of Matter Transport and Energy Arizona State UniversityTempeAZ 85287USA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Materials Science and Technology Division Los Alamos National LabLos AlamosNM 87545USA Department of Mechanical Engineering Virginia TechBlacksburgVA 24061USA Department of Physics and Astronomy Rutgers UniversityPiscatawayNJ 08901USA

The Joint Automated Repository for Various Integrated Simulations(JARVIS)is an integrated infrastructure to accelerate materials discovery and design using density functional theory(DFT),classical force-fields(FF),and machine learning(ML)*** is motivated by the Materials Genome Initiative(MGI)principles of developing open-access databases and tools to reduce the cost and development time of materials discovery,optimization,and deployment.

关键词： automated JAR databases

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