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arXiv 2023年

作者： Li, Xintong Zhou, Peng Hu, Xuan Rivers, Ethan Watanabe, Kenji Taniguchi, Takashi Akinwande, Deji Friedman, Joseph S. Incorvia, Jean Anne C. Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Dallas RichardsonTX75080-3021 United States Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

Ambipolar dual-gate transistors based on two-dimensional (2D) materials, such as graphene, carbon nanotubes, black phosphorus, and certain transition metal dichalcogenides (TMDs), enable reconfigurable logic circuits with suppressed off-state current. These circuits achieve the same logical output as CMOS with fewer transistors and offer greater flexibility in design. The primary challenge lies in the cascadability and power consumption of these logic gates with static CMOS-like connections. In this article, high-performance ambipolar dual-gate transistors based on tungsten diselenide (WSe2) are fabricated. A high on-off ratio of 108and 106, a low off-state current of 100 to 300 fA, a negligible hysteresis, and an ideal subthreshold swing of 62 and 63 mV/dec are measured in the p- and n-type transport, respectively. For the first time, we demonstrate cascadable and cascaded logic gates using ambipolar TMD transistors with minimal static power consumption, including inverters, XOR, NAND, NOR, and buffers made by cascaded inverters. A thorough study of both the control gate and polarity gate behavior is conducted, which has previously been lacking. The noise margin of the logic gates is measured and analyzed. The large noise margin enables the implementation of VT-drop circuits, a type of logic with reduced transistor number and simplified circuit design. Finally, the speed performance of the VT-drop and other circuits built by dual-gate devices are qualitatively analyzed. This work lays the foundation for future developments in the field of ambipolar dual-gate TMD transistors, showing their potential for low-power, high-speed and more flexible logic circuits. © 2023, CC BY.

关键词： Logic gates

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Robust Skyrmion Shift Device Through engineering the Local Exchange-Bias Field

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Physical Review Applied 2020年第4期14卷 044008-044008页

作者： Z.R. Yan Y.Z. Liu Y. Guang J.F. Feng R.K. Lake G.Q. Yu X.F. Han Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Department of Electrical and Computer Engineering University of California Riverside California 92521 USA Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China

Magnetic skyrmions are topologically protected spin structures, offering great promise as information carriers for future spintronic devices. However, a series of challenges, such as unreliable skyrmion motion, pinning effects, and a weak readout signal, prevent the development of skyrmionic applications. The recently demonstrated capability to engineer the local exchange-bias field (LEBF) in an exchange-biased composite, provides solutions to these challenges. By exploiting LEBF, we design and analyze a robust skyrmion shift device. LEBF-induced magnetic domain walls form the boundary of the device channel, and LEBF potential wells are implemented in the channel for positioning skyrmions. Based on simulations with comprehensive models, we demonstrate the proposed device has the advantages of (i) localizing the skyrmions in the absence of current, (ii) suppressing skyrmion annihilation during transport, (iii) promoting steady skyrmion motion, (iv) enhancing the skyrmion velocity, and (v) magnifying the readout signal. Our results form the basis for the design of robust skyrmion devices through LEBF engineering.

关键词： Domain walls Exchange bias Skyrmions Spintronics Transport phenomena Antiferromagnets Devices Magnetic multilayers

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Nematoelasticity of hybrid molecular-colloidal liquid crystals

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Physical Review E 2021年第1期104卷 014703-014703页

作者： B. Senyuk H. Mundoor I. I. Smalyukh H. H. Wensink Department of Physics University of Colorado Boulder Colorado 80309 USA Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program and Soft Materials Research Center University of Colorado Boulder Colorado 80309 USA Chemical Physics Program Departments of Chemistry and Physics University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA Laboratoire de Physique des Solides Université Paris-Saclay & CNRS UMR 8502 91405 Orsay France

Colloidal rods immersed in a thermotropic liquid-crystalline solvent are at the basis of so-called hybrid liquid crystals, which are characterized by tunable nematic fluidity with symmetries ranging from conventional uniaxial nematic or antinematic to orthorhombic [Mundoor et al., science 360, 768 (2018)]. We provide a theoretical analysis of the elastic moduli of such systems by considering interactions between the individual rods with the embedding solvent through surface-anchoring forces, as well as steric and electrostatic interactions between the rods themselves. For uniaxial systems, the presence of colloidal rods generates a marked increase of the splay elasticity, which we found to be in quantitative agreement with experimental measurements. For orthorhombic hybrid liquid crystals, we provide estimates of all 12 elastic moduli and show that only a small subset of those elastic constants play a relevant role in describing the nematoelastic properties. The complexity and possibilities related to identifying the elastic moduli in experiments are briefly discussed.

关键词： Biaxial liquid crystals Liquid crystals

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Linking Molecular Origin of Melt Fragility Index with Topological Phases of Network Glasses

SSRN

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SSRN 2023年

作者： Gogi, Vamshi Kiran Mandal, Avik Welton, Aaron Mohanty, Chandi Bhosle, Siddhesh Chakraborty, Shibalik Gunasekera, Kapila Chakravarty, Soumendu Almutairi, Badriah Boolchand, Punit Department of Electrical Engineering and Computer Science University of Cincinnati CincinnatiOH45221-0030 United States Department of Mechanical and Materials Engineering University of Cincinnati CincinnatiOH United States Department of Physics University of Cincinnati CincinnatiOH United States

Network glasses are composed of three topological phases: flexible, intermediate, and stressed-rigid. Intermediate Phase (IP) glasses form compact, rigid, and stress-free networks with no Open Degrees of Freedom (ODF). IP melts are observed to be super-strong with the lowest fragility index, m = 15 due to the absence of ODF in the parent glass. This feature is general and observed in multiple selenide, sulfide, and modified oxide glasses can be traced to Isostatically Rigid Local Structures (ISRLSs) formed in the IP. On the other hand, the flexible and stressed-rigid phase glasses form non-compacted and stressed networks with increasing residual pressure as the count of ODF increases. Their melts are found to be fragile and display fragility indices m > 20 as the count of the ODF in the glass increases and the count of ISRLSs dissipates. © 2023, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Incipient fault detection in induction machine stator-winding using a fuzzy-Bayesian two change points detection approach

Incipient fault detection in induction machine stator-windin...

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2010 9th IEEE/IAS International Conference on Industry Applications, INDUSCON 2010

作者： Moreira, Fabiano S. D'Angelo, Marcos F. S. V. Palhares, Reinaldo M. Caminhas, Walmir M. Federal University of Minas Gerais Graduate Program in Electrical Engineering Av. Antônio Carlos 6627 31270-901 - Belo Horizonte - MG Brazil Universidade Estadual de Montes Claros Department of Computer Science Av. Rui Braga s/n Vila Mauricéia 39401-089 - Montes Claros - MG Brazil

ISBN: (纸本)9781424480104

In this paper the incipient fault detection problem in induction machine stator-winding is considered. The problem is solved using a new technique of change point detection in time series, based on a three-step formulation. The technique can detect up to two change points in the time series. The first step consists of a Kohonen neural network classification algorithm that defines the model to be used, one change point or two change points. The second step consists of a fuzzy clustering to transform the initial data, with arbitrary distribution, into a new one that can be approximated by a beta distribution. The fuzzy cluster centers are determined by using the Kohonen neural network classification algorithm used in the first step. The last step consists in using the Metropolis-Hastings algorithm for performing the change point detection in the transformed time series generated by the second step with that known distribution. The incipient faults are detected as long as they characterize change points in such transformed time series. The main contribution of the proposed approach in this paper, related to previous one in the Literature, is to detect up to two change points in the time series considered, besides the enhanced resilience of the new fault detection procedure against false alarms, combined with a good sensitivity that allows the detection of rather small fault signals. Simulation results are presented to illustrate the proposed methodology. © 2010 IEEE.

关键词： Time series

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Enhanced B2 ordering of FeRh thin films using B2 NiAl underlayers

Enhanced B2 ordering of FeRh thin films using B2 NiAl underl...

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作者： Kande, Dhishan Pisana, Simone Weller, Dieter Laughlin, David E. Zhu, Jian-Gang Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh PA 15213 United States Data Storage Systems Center Carnegie Mellon University Pittsburgh PA 15213 United States San Jose Research Center Hitachi Global Storage Technologies San Jose CA 95135 United States Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213 United States

B2-ordered FeRh thin films undergo a first-order magnetic transition from an antiferromagnetic (AFM) state at low temperature to a ferromagnetic (FM) state above 350 K and reverse back on cooling with a finite hysteresis. This property makes them very attractive for use in temperature-controlled exchange coupling layers for heat-assisted magnetic recording. In order to be used as an exchange coupling layer, the goal is to fabricate ultra-thin films of FeRh that show reversible AFM-FM switching. For thinner films grown on MgO substrates, there exists an FM signal below the AFM-FM transition temperature. It is demonstrated that there is a direct correlation between the low-temperature FM fraction and the extent of atomic ordering. Based on this observation, the enhanced atomic order in FeRh grown on NiAl underlayers is shown to result in bulk-like AFM-FM switching, especially for the thinner films. © 2011 IEEE.

关键词： Iron alloys

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Cobalt and Titanium Metallization of SiGeC for Shallow Contacts

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MRS Online Proceedings Library 2011年第1期427卷 529-533页

作者： A. E. Bair T. L. Alford Z. Atzmon S. D. Marcus D. C. Doller R. Morton S. S. Lau J. W. Mayer Department of Chemical Bio and Materials Engineering Arizona State University Tempe USA AST Elektronik USA Tempe USA Department of Electrical and Computer Engineering University of California at San Diego La Jolla USA Center for Solid State Science Arizona State University Tempe USA

Shallow contact metallization of SiGeC was studied in anticipation of this alloys use in low power applications. It has been shown that in the solid state reaction of Co on (100) Si, that Co is the moving species with proper annealing conditions. This prevents the formation of Kirkendal voiding in certain device structures. This work studies the Co and Ti metallization of SiGeC. A bilayer of 44 nm of Co on 7 nm of Ti, were electron beam evaporated onto epitaxially grown Si0.77Ge0.21C0.02. The samples were rapid thermal processed at 600 and 900 °C for up to two minutes in a nitrogen ambient. The analysis techniques used were Rutherford backscattering spectrometry which included the used of the 4.27 MeV 12C(α,α)12C resonance reaction, glancing angle x-ray diffraction. During annealing at all temperatures, Co diffused through the Ti layer and formed CoSi. This phase was confirmed by x-ray diffraction. The Co displaced the Ti to the surface. At 600 °C, Ge diffused to the surface layer, while at 900 °C it was rejected back into the original SiGeC. The sample annealed at 600 °C was subsequently annealed at 900 °C. The Ge in the surface layer was rejected from the surface layer, diffused across the CoSi and back into the SiGeC.

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Applying the MVC EA-IRPM to reporting-guidelines in medicine: A strategy that is a web system 4

Applying the MVC EA-IRPM to reporting-guidelines in medicine...

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4th IEEE EMBS International Conference on Biomedical and Health Informatics, BHI 2017

作者： Letouze, Patrick De Souza, J.I.M. Silva, Valeria Martins Climaco, Glaubos Chagas, F.B. Ishihara, Joao Y. Graduate Program of Computational Modeling of Systems Universidade Federal Do Tocantins Quadra 109 Norte Avenida NS-15 Palmas77001-090 Brazil Graduate Program of Systems' Engineering and Computation - PESC Universidade Federal Do Rio de Janeiro Rio de Janeiro Brazil Department of Informatics at the Universidade Federal Do Maranh/ Ao - UFMA Brazil Faculty of Computer Science Faculdade Pitagoras Imperatriz Imperatriz Brazil Faculty of Electrical Engineering Universidade de Brasília Brasília Brazil

ISBN: (纸本)9781509041794

Reporting-Guidelines in Medicine play an important role in promoting the quality of reports in health-related research. For instance, a poorly reported research may induce misinterpretation and inappropriate clinical settings. Basically, three major issues regarding Reporting-Guidelines in Medicine has to be addressed: (1) the existence of lots of reporting guidelines covering a broad spectrum of medical research increases the difficulties when reporting a medical research because it may not be clear which guidelines are applicable, or if all related guidelines are considered;(2) most guideline developers have not described how their guidance was developed, consequently tracking guidelines and features for evaluation, or even for correcting, may be not possible;(3) few guideline developers have evaluated the effectiveness of their guidance, then the real value that the guideline brings to reporting the research is not assured. Hence, we propose a solution to these three issues based on the Model-View-Controller Evolutionary Acquisition Interdisciplinary Research Project Management (MVC EA-IRPM) that is simultaneously a strategy and a web system for the development and management of reporting guidelines. © 2017 IEEE.

关键词： Clinical research

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Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

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Advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat *** metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be *** and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually *** demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized *** the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior *** dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

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Amorphous Ta2sno6: A Hole-Dopable P-Type Oxide

SSRN

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SSRN 2022年

作者： Hu, Yaoqiao Schlom, Darrell Datta, Suman Cho, Kyeongjae Department of Materials Science and Engineering The University of Texas at Dallas RichardsonTX75080 United States Department of Materials Science and Engineering Cornell University IthacaNY14853-1501 United States Kavli Institute at Cornell for Nanoscale Science IthacaNY14853 United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States

Recent research work on searching for high mobility p-type oxides has identified substantial promising p-type oxide candidates. However, very few of them have been experimentally proven with high p-type conductivity, due to their limited p-type dopability caused by the deep valence band edge (VBE). In this work, we report amorphous phase Ta2SnO6 (a-Ta2SnO6) possessing unusually shallow VBE that permits high p-type doping without hole-killing oxygen vacancy defects spontaneous formation, contrasting to crystalline Ta2SnO6 (c-Ta2SnO6). The shallow VBE in a-Ta2SnO6 also allows a low Schottky barrier height with contact metals and unique a-/c- Ta2SnO6 heterostructure device. The shallow VBE in a-Ta2SnO6 is due to the local structure disorder that circumvents the strong electrostatic Coulombic interaction between positively charged Ta5+ and Sn-5s lone-pair electrons which accounts for the deep VBE and low p-type dopability in c-Ta2SnO6 © 2022, The Authors. All rights reserved.

关键词： Tin compounds

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