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arXiv 2019年

作者： Yuan, Jiaren Yang, Yumeng Cai, Yongqing Wu, Yihong Feng, Yuan Ping Chen, Yuanping Yan, Xiaohong Shen, Lei College of Science School of Material Science and Engineering Jiangsu University Zhenjiang212013 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore Institute of High Performance Computing A*STAR 1 Fusionopolis Way Singapore138632 Singapore Department of Physics and Centre for Advanced Two-Dimensional Materials National University of Singapore 2 Science Drive 3 117551 Singapore Department of Mechanical Engineering and Engineering Science National University of Singapore 9 Engineering Drive 1 117542 Singapore

Skyrmions are localized solitonic spin textures with protected topology, which are promising as information carriers in ultra-dense and energy-efficient logics and memories. Magnetic skyrmions have been recently observed in thick magnetic multilayers and are stabilized by the extrinsic interfacial Dzyaloshinskii–Moriya interaction (DMI) and external magnetic fields. Here, we investigate the intrinsic magnetic skyrmions in four monolayer Janus van der Waals magnets, MnSSe, MnSTe, MnSeTe, and VSeTe, by the first-principles calculations combined with micromagnetic simulations. It is found that the monolayer Janus MnSTe and MnSeTe with out-of-plane asymmetry and strong spin-orbit coupling (SOC) have a large intrinsic DMI. Using micromagnetic simulations, we demonstrate that skyrmions can be stabilized in monolayer MnSTe and MnSeTe within sub-50 nm scale in the absence of magnetic fields. On the other hand, VSeTe (in-plane easy axis) forms chiral magnetic domains. Finally, the size and shape of skyrmions can be regulated using an external magnetic field. Our work opens a new vista for seeking intrinsic skyrmions in atomic-scale van der Waals magnets. Copyright © 2019, The Authors. All rights reserved.

关键词： Tellurium compounds

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All-optical reconfigurable chiral meta-molecules

arXiv

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arXiv 2019年

作者： Lin, Linhan Lepeshov, Sergey Krasnok, Alex Jiang, Taizhi Peng, Xiaolei Korgel, Brian A. Alu, Andrea Zheng, Yuebing Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute University of Texas at Austin AustinTX78712 United States ITMO University St. Petersburg197101 Russia Department of Electrical and Computer Engineering University of Texas at Austin AustinTX78712 United States Mc Ketta Department of Chemical Engineering University of Texas at Austin AustinTX78712 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Department of Electrical Engineering City College of The City University New YorkNY10031 United States

Chirality is a ubiquitous phenomenon in the natural world. Many biomolecules without inversion symmetry such as amino acids and sugars are chiral molecules. Measuring and controlling molecular chirality at a high precision down to the atomic scale are highly desired in physics, chemistry, biology, and medicine, however, have remained challenging. Herein, we achieve all-optical reconfigurable chiral meta-molecules experimentally using metallic and dielectric colloidal particles as artificial atoms or building blocks to serve at least two purposes. One is that the on-demand meta-molecules with strongly enhanced optical chirality are well-suited as substrates for surface-enhanced chiroptical spectroscopy of chiral molecules and as active components in optofluidic and nanophotonic devices. The other is that the bottom-up-assembled colloidal meta-molecules provide microscopic models to better understand the origin of chirality in the actual atomic and molecular systems. Copyright © 2019, The Authors. All rights reserved.

关键词： Atoms

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Spatially resolved steady-state negative capacitance (vol 565, pg 468, 2019)

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NATURE 2019年第7753期568卷 E13-E13页

作者： Yadav, Ajay K. Nguyen, Kayla X. Hong, Zijian Garcia-Fernandez, Pablo Aguado-Puente, Pablo Nelson, Christopher T. Das, Sujit Prasad, Bhagwati Kwon, Daewoong Cheema, Suraj Khan, Asif I. Hu, Chenming Iniguez, Jorge Junquera, Javier Chen, Long-Qing Muller, David A. Ramesh, Ramamoorthy Salahuddin, Sayeef Department of Electrical Engineering and Computer Sciences University of California Berkeley USA Department of Chemistry and Chemical Biology Cornell University Ithaca USA Department of Materials Science and Engineering Pennsylvania State University State College USA Departamento de Ciencias de la Tierra y Física de la Materia Condensada Universidad de Cantabria Cantabria Campus Internacional Santander Spain Atomistic Simulation Centre Queen’s University Belfast Belfast UK National Center for Electron Microscopy Lawrence Berkeley Laboratory Berkeley USA Department of Materials Science and Engineering University of California Berkeley USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA Materials Research and Technology Department Luxembourg Institute of Science and Technology Esch/Alzette Luxembourg School of Applied and Engineering Physics Cornell University Ithaca USA Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca USA

In this Letter, the first name of author Bhagwati Prasad was misspelled Bhagawati. This error has been corrected online.

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Low-cost,μm-thick,tape-free electronic tattoo sensors with minimized motion and sweat artifacts

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npj Flexible Electronics 2018年第1期2卷 35-41页

作者： Youhua Wang Yitao Qiu Shideh Kabiri Ameri Hongwoo Jang Zhaohe Dai YongAn Huang Nanshu Lu Center for Mechanics of Solids Structures and MaterialsDepartment of Aerospace Engineering and Engineering MechanicsThe University of Texas at AustinAustinTX 78712USA State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanChina Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhanChina Deparment of Electrical and Computer Engineering The University of Texas at AustinAustinTXUSA Texas Materials Institute The University of Texas at AustinAustinTXUSA Department of Biomedical Engineering The University of Texas at AustinAustinTXUSA Present address:Department of Civil&Environmental Engineering Stanford UniversityStanfordCA 94305USA

Electronic tattoos(e-tattoos),also known as epidermal electronics,are ultra-thin and ultra-soft noninvasive but skin-conformable devices with capabilities including physiological sensing and transdermal stimulation and *** fabrication of e-tattoos out of conventional inorganic electronic materials used to be tedious and *** developed cut-and-paste method has significantly simplified the process and lowered the ***,existing cut-and-paste method entails a medical tape on which the electronic tattoo sensors should be pasted,which increases tattoo thickness and degrades its *** address this problem,here we report a slightly modified cut-and-paste method to fabricate low-cost,open-mesh e-tattoos with a total thickness of just 1.5μm.E-tattoos of such thinness can be directly pasted on human skin and conforms to natural skin *** demonstrate that this ultra-thin,tape-free e-tattoo can confidently measure electrocardiogram(ECG),skin temperature,and skin *** rate and even respiratory rate can be extracted from the ECG signals.A special advantage of such ultra-thin e-tattoo is that it is capable of high-fidelity sensing with minimized motion artifacts under various body *** of perspiration are found to be insignificant due to the breathability of such e-tattoos.

关键词： paste cost electronic

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Correction to: Pharmacological Rescue With SR8278, A Circadian Nuclear Receptor REV-ERBα Antagonist As A Therapy for Mood Disorders In Parkinson's Disease

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Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics 2022年第4期19卷 1432页

作者： Jeongah Kim Inah Park Sangwon Jang Mijung Choi Doyeon Kim Woong Sun Youngshik Choe Ji-Woong Choi Cheil Moon Sung Ho Park Han Kyoung Choe Kyungjin Kim Department of Brain Sciences Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Korea. Department of Anatomy College of Medicine Korea University Seoul Korea. Program in Neurosciences & Mental Health The Hospital for Sick Children Toronto ON Canada. Korea Brain Research Institute (KBRI) Daegu Korea. Department of Electrical Engineering and Computer Science DGIST Daegu Korea. Convergence Research Advanced Centre for Olfaction DGIST Daegu Korea. Department of Biological Sciences Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Korea. Department of Brain Sciences Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Korea. kyungjin@dgist.ac.kr. Convergence Research Advanced Centre for Olfaction DGIST Daegu Korea. kyungjin@dgist.ac.kr.

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Real-space observation of skyrmion clusters with mutually orthogonal skyrmion tubes

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Physical Review B 2019年第10期100卷 104401-104401页

作者： Hayley R. O. Sohn Sergei M. Vlasov Valeriy M. Uzdin Andrey O. Leonov Ivan I. Smalyukh Soft Materials Research Center and Materials Science and Engineering Program University of Colorado Boulder Colorado 80309 USA ITMO University 197101 Saint Petersburg Russia Department of Physics Saint Petersburg State University Saint Petersburg 198504 Russia Chirality Research Center Hiroshima University Higashi Hiroshima Hiroshima 739-8526 Japan Department of Chemistry Faculty of Science Hiroshima University Kagamiyama Higashi Hiroshima Hiroshima 739-8526 Japan IFW Dresden Postfach 270016 D-01171 Dresden Germany Department of Physics and Department of Electrical Computer and Energy Engineering University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

We report the discovery and direct visualization of skyrmion clusters with mutually orthogonal orientations of constituent isolated skyrmions in chiral liquid crystals and ferromagnets. We show that the nascent conical state underlies the attracting inter-skyrmion potential, whereas an encompassing homogeneous state leads to the repulsive skyrmion-skyrmion interaction. The crossover between different regimes of skyrmion interaction could be identified upon changing layer thickness and/or the surface anchoring. We develop a phenomenological theory describing two types of skyrmions and the underlying mechanisms of their interaction. We show that isolated horizontal skyrmions with the same polarity may approach a vertical isolated skyrmion from both sides and thus constitute two energetically different configurations which are also observed experimentally. In an extreme regime of mutual attraction, the skyrmions wind around each other forming compact superstructures with undulations. We also indicate that our numerical simulations on skyrmion clusters are valid in a parameter range corresponding to the A-phase region of cubic helimagnets.

关键词： Exotic phases of matter Helicoidal magnetic texture Micromagnetism Nematic order Nucleation Skyrmions Spin texture Symmetry protected topological states

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Author Correction: 3D-printed liquid metal polymer composites as NIR-responsive 4D printing soft robot

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Nature communications 2024年第1期15卷 943页

作者： Liwen Zhang Xumin Huang Tim Cole Hongda Lu Jiangyu Hang Weihua Li Shi-Yang Tang Cyrille Boyer Thomas P Davis Ruirui Qiao Australian Institute of Bioengineering & Nanotechnology The University of Queensland Brisbane QLD 4072 Australia. Department of Electronic Electrical and Systems Engineering University of Birmingham Birmingham UK. School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong NSW 2522 Australia. School of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK. shiyang.tang@soton.ac.uk. Cluster for Advanced Macromolecular Design School of Chemical Engineering The University of New South Wales Sydney NSW 2052 Australia. Australian Institute of Bioengineering & Nanotechnology The University of Queensland Brisbane QLD 4072 Australia. t.davis@uq.edu.au. Australian Institute of Bioengineering & Nanotechnology The University of Queensland Brisbane QLD 4072 Australia. r.qiao@uq.edu.au.

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Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers

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Physical Review Letters 2019年第8期122卷 086402-086402页

作者： Fengcheng Wu Timothy Lovorn Emanuel Tutuc Ivar Martin A. H. MacDonald Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA Condensed Matter Theory Center and Joint Quantum Institute Department of Physics University of Maryland College Park Maryland 20742 USA Department of Physics University of Texas at Austin Austin Texas 78712 USA Department of Electrical and Computer Engineering Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 USA

We show that moiré bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in ±K valleys of twisted bilayer transition metal dichalcogenides, in particular, bilayer MoTe2. Because of the large spin-orbit splitting at the monolayer valence band maxima, the low energy valence states of the twisted bilayer MoTe2 at the +K (−K) valley can be described using a two-band model with a layer-pseudospin magnetic field Δ(r) that has the moiré period. We show that Δ(r) has a topologically nontrivial skyrmion lattice texture in real space, and that the topmost moiré valence bands provide a realization of the Kane-Mele quantum spin-Hall model, i.e., the two-dimensional time-reversal-invariant topological insulator. Because the bands narrow at small twist angles, a rich set of broken symmetry insulating states can occur at integer numbers of electrons per moiré cell.

关键词： Electronic structure Kane-Mele model Quantum spin Hall effect Topological insulators Transition metal dichalcogenides Two-dimensional electron system

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Soft Electronics: Soft Electronics for the Skin: From Health Monitors to Human–Machine Interfaces (Adv. Mater. Technol. 9/2020)

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Advanced materials Technologies 2020年第9期5卷

作者： Zhoulyu Rao Faheem Ershad Abdullah Almasri Lei Gonzalez Xiaoyang Wu Cunjiang Yu Materials Science and Engineering Program University of Houston Houston TX 77204 USA Department of Biomedical Engineering University of Houston Houston TX 77204 USA Ben May Department for Cancer Research The University of Chicago Chicago IL 60637 USA Department of Mechanical Engineering Department of Electrical and Computer Engineering Texas Center for Superconductivity University of Houston Houston TX 77204 USA

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Erratum: Total variation superiorized conjugate gradient method for image reconstruction (2018 Inverse Problems 34 034001)

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Inverse Problems 2020年第8期36卷

作者： Marcelo V W Zibetti Chuan Lin Gabor T Herman Graduate Program in Electrical Engineering and Computer Science Federal University of Technology—Paraná Curitiba 80230-901 Brazil School of Electrical Engineering Southwest Jiaotong University Chengdu Sichuan 610031 People's Republic of China Department of Computer Science The Graduate Center City University of New York NY 10016 United States of America

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