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arXiv 2023年

作者： Xu, Qiang Del Ben, Mauro Okyay, Mahmut Sait Choi, Min Ibrahim, Khaled Z. Wong, Bryan M. Materials Science & Engineering Program Department of Chemistry Department of Physics & Astronomy University of California-Riverside RiversideCA92521 United States Applied Mathematics & Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

We present a new velocity-gauge real-time, time-dependent density functional tight-binding (VG-rtTDDFTB) implementation in the open-source DFTB+ software package (https://***) for probing electronic excitations in large, condensed matter systems. Our VG-rtTDDFTB approach enables real-time electron dynamics simulations of large, periodic, condensed matter systems containing thousands of atoms with a favorable computational scaling as a function of system size. We provide computational details and benchmark calculations to demonstrate its accuracy and computational parallelizability on a variety of large material systems. As a representative example, we calculate laser-induced electron dynamics in a 512-atom amorphous silicon supercell to highlight the large periodic systems that can be examined with our implementation. Taken together, our VG-rtTDDFTB approach enables new electron dynamics simulations of complex systems that require large periodic supercells, such as crystal defects, complex surfaces, nanowires, and amorphous materials. Copyright © 2023, The Authors. All rights reserved.

关键词： Gages

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Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe_(3)

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Chinese Physics Letters 2021年第7期38卷 110-115页

作者： Shuai Liu Si-Min Nie Yan-Peng Qi Yan-Feng Guo Hong-Tao Yuan Le-Xian Yang Yu-Lin Chen Mei-Xiao Wang Zhong-Kai Liu School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Department of Materials Science and Engineering Stanford UniversityStanfordCA 94305USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China Department of Physics University of OxfordOxfordOX13PUUK ShanghaiTech Laboratory for Topological Physics Shanghai 201210China

Topological superconductors(TSCs)have been widely investigated in recent years due to their novel physics and ability to host Majorana fermions(MFs)which are key to topological quantum *** the great interest,only a few compounds have been proposed as candidates of intrinsic TSCs,such as iron-based superconductor FeSe_(0.55)Te_(0.45) and 2M-WS_(2).Among them,quasi-one-dimensional superconductor TaSe_(3) possesses fascinating properties such as its simple stoichiometry,layered nature and chemical ***,using scanning tunneling microscope/spectroscopy(STM/STS),we systematically investigate the topography and electronic structure of TaSe_(3).Our STM/STS measurement reveals large atomically flat,defect-free surfaces suitable for the search of MF;electronic density of states consistent with our angle-resolved photoemission result and band-structure calculations,and a uniform superconducting gap with a typical size of∼0.25 ***,additional edge states are observed in the vicinity of the terrace edge,suggesting they may have a topological *** result proves the coexistence of superconductivity and topological electronic structure in TaSe_(3),making it an intriguing platform to investigate topological superconductivity.

关键词： stability topological superconductor

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Comment on “Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure”

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Physical Review Letters 2022年第21期128卷 219601-219601页

作者： Enlai Gao Ke Zhou Lei Shi Zhiping Xu Department of Engineering Mechanics School of Civil Engineering Wuhan University Wuhan Hubei 430072 China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi’an Jiaotong University 710049 Xi’an China State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research Center School of Materials Science and Engineering Sun Yat-sen University Guangzhou 510275 Guangdong China Applied Mechanics Laboratory Department of Engineering Mechanics and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China

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Ion-Beam Radiation-Induced Eshelby Transformations: The Mean and Variance in Hydrostatic and Shear Residual Stresses

arXiv

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arXiv 2022年

作者： Chen, Yongchao Li, Qing-Jie O'Brien, Alex Yang, Yang He, Qi Bloore, David A. Vlassak, Joost J. Li, Ju Department of Nuclear Science and Engineering MIT CambridgeMA02139 United States John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Engineering Science and Mechanics Materials Research Institute The Pennsylvania State University University Park PA16801 United States Department of Materials Science and Engineering MIT CambridgeMA02139 United States

Ion beam plays a pivotal role in ion implantations and the fabrication of nanostructures. However, there lacks a quantitative model to describe the residual stresses associated with the ion-beam radiation. Radiation-induced residual stress/transformation strain have been mostly recognized in the hydrostatic sub strain space. Here, we use molecular dynamics (MD) simulations to show that the response of a material to irradiation is generally anisotropic that depends on the ion-beam direction, and should be described using tensorial quantities. We demonstrate that accelerator-based ion beam irradiation, combined with the intrinsic lattice anisotropy and externally induced anisotropy (such as anisotropic mechanical loadings), causes radiation-actuated shear transformation strains in addition to hydrostatic expansion. We map out these complex correlations for several materials. Radiation-induced defects are shown to be responsible for residual shear stresses in the manner of Eshelby inclusion transformation. We propose such tensorial response model should be considered for accurate nanoscale fabrication using ion-beam irradiation. © 2022, CC BY.

关键词： Ions

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Wireless,multimodal sensors for continuous measurement of pressure,temperature,and hydration of patients in wheelchair

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npj Flexible Electronics 2023年第1期7卷 479-493页

作者： Seokjoo Cho Hyeonseok Han Hyunwoo Park Sung-Uk Lee Jae-Hwan Kim Sung Woo Jeon Mengqiu Wang Raudel Avila Zhaoqian Xi Kabseok Ko Minsu Park Jungyup Lee Myungwoo Choi Je-Sang Lee Weon Gi Min Byeong-Ju Lee Soyeong Lee Jungrak Choi Jimin Gu Jaeho Park Min Seong Kim Junseong Ahn Osman Gul Chankyu Han Gihun Lee Seunghwan Kim Kyuyoung Kim Jeonghyun Kim Chang-Mo Kang Jahyun Koo Sung Soo Kwak Sungbong Kim Dong Yun Choi Seokwoo Jeon Hyung Jin Sung Yong Bae Park Minkyu Je Young Tae Cho Yong Suk Oh Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Advanced 3D Printing Technology Development Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116023P.R.China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Ningbo Institute of Dalian University of Technology Ningbo 315016China Department of Electronics Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Querrey-Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Sibel Health Inc NilesIL 60714USA Department of Materials Science and Engineering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Rehabilitation Medicine Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of planning and development Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of rehabilitation medicine Pusan national university hospitalBusan 49241Republic of Korea Department of AI Convergence Network Ajou UniversitySuwon 16499Republic of Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Korea Photonics Technology Institute Gwangju 61007Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02841Republic of Korea Center

Individuals who are unable to walk independently spend most of the day in a *** population is at high risk for developing pressure injuries caused by ***,early diagnosis and prevention of these injuries still remain ***,we introduce battery-free,wireless,multimodal sensors and a movable system for continuous measurement of pressure,temperature,and hydration at skin *** device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity,a temperature sensor for measuring skin temperature,and a galvanic skin response sensor for measuring skin hydration *** movable system enables power harvesting,and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body *** evaluations and numerical simulations of the devices,together with clinical trials for wheelchair patients,demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.

关键词： injuries modal mounted

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Rui Xu Tong Lin Jiaming Luo Xiaotong Chen Elizabeth R. Blackert Alyssa R. Moon Khalil M. JeBailey Hanyu Zhu Department of Materials Science and Nano Engineering Rice University Houston U.S.A. Applied Physics Graduate Program Rice University Houston U.S.A. Nanotechnology Research Experience for Undergraduates (Nano REU) Program Rice University Houston U.S.A.

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO 3 . We designed planar ultrafast concentrators that amplifies transient electric fiel... 详细信息

ISBN: (纸本)9781957171258

关键词： Concentrators Electric fields Fast Fourier transforms Field enhancement Fused silica Second harmonic generation

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模块化局域元素供应技术批量制备12英寸过渡金属硫族化合物

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science Bulletin 2023年第14期68卷 1514-1521,M0004页

作者：薛国栋隋鑫殷鹏周子琦李修臻程阳郭泉林张帅文耀左勇刚赵翀吴慕鸿高鹏李群仰何军王恩哥张广宇刘灿刘开辉 State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China International Centre for Quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing 100871China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Department of PhysicsRenmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials Peking UniversityBeijing 100871China Applied Mechanics Laboratory Department of Engineering MechanicsTsinghua UniversityBeijing 100084China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Wuhan UniversityWuhan 430072China Key Laboratory of Unconventional Metallurgy(Ministry of Education) Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650032China Songshan Lake Materials Laboratory Dongguan 523808China

二维过渡金属二硫族化合物(TMDs)因其原子级厚度、高载流子迁移率和超快电荷转移等优点而被认为是下一代半导体器件的核心材料.与传统半导体工业类似,晶圆级TMDs材料的批量生产是其集成电路发展的先决条件.然而,由于生长过程中需要严格... 详细信息

二维过渡金属二硫族化合物(TMDs)因其原子级厚度、高载流子迁移率和超快电荷转移等优点而被认为是下一代半导体器件的核心材料.与传统半导体工业类似,晶圆级TMDs材料的批量生产是其集成电路发展的先决条件.然而,由于生长过程中需要严格满足多种前驱体的有效传输,TMDs晶圆的制备能力通常局限在每批次单片和小片(主要尺寸为2~4英寸).本研究开发了一种用于批量生产晶圆级TMDs的模块化生长策略,可以制造从2英寸(每批15片)到突破性的12英寸(每批3片)的TMDs晶圆.其中,每个模块包括供应TMDs晶圆生长的自充足的局域前驱体供应单元,通过将多个模块堆叠组装形成阵列可实现批量化制备.利用包括光谱学、电子显微镜和电学测量在内的多种表征技术,可以证明制得的单层薄膜具有高结晶度和大面积均匀性.此外,该模块化单元可以将制备的晶圆级MoS_(2)取代转换为多种结构,例如,Janus型MoSSe结构,MoS_(2(1-x))Se_(2x)合金以及MoS_(2)-MoSe_(2)平面异质结等,充分体现了本制备策略的可扩展性.本研究展现了高质量和高产量的晶圆批量生产能力,有望推动二维半导体从实验室规模到工业化规模的无缝过渡,实现与传统硅基技术的互补.

关键词：批量生产半导体工业实验室规模过渡金属硫族化合物晶圆级半导体器件电学测量主要尺寸

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Gallium Oxide as Photonic Integrated Platforms in the UV-Visible Spectra

Gallium Oxide as Photonic Integrated Platforms in the UV-Vis...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Zhou, Jingan Zhao, Xuan Xu, Rui Zhang, Xiang Fu, Kai Li, Tao Xu, Mingfei Luo, Shisong He, Ziyi Robinson, Jacob T. Zhu, Hanyu Ajayan, Pulickel M. Zhang, Xiaodong Zhao, Yuji Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States School of Electrical Computer and Energy Engineering Arizona State University TempeAZ85287 United States Nanofabrication facility Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Jiangsu Suzhou215123 China

We report the Ga2O3 as photonic integrated platforms and its nonlinear optical effects in the UV-visible spectra. A low propagation loss of 3.7 dB/cm and second-order susceptibility of x(2)=4.89xl03pm/V were obtained.... 详细信息

ISBN: (纸本)9781957171258

关键词： Gallium compounds

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An Interfacially Consistent Phase-Field Model for Solid-State Sintering Without Artificial Void Generation

SSRN

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SSRN 2022年

作者： Yang, Qingcheng Gao, Yongxin Kirshtein, Arkadz Zhen, Qiang Liu, Chun Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering Science Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai200072 China Zhejiang Laboratory Hangzhou311100 China Department of Mathematics Tufts University MedfordMA02155 United States Nano-Science and Technology Research Center Shanghai University 200072 China School of Materials Science and Engineering Shanghai University 200072 China Department of Applied Mathematics Illinois Institute of Technology ChicagoIL60616 United States

In this work, the analysis of interfacial consistency on phase-field modeling of solid-state sintering is performed. A phase-field model is termed interfacially consistent if no artificial void is produced at junctions of grain boundaries in fully dense powder compacts under sintering. A mathematical analysis of the well-known and widely employed phase-field model, termed Model I in this work, found that Model I may offer a spurious driving force for producing artificial voids at the junctions of grain boundaries, and that the ratio of specific grain boundary energy to specific surface energy and the number of grain boundaries meeting at junctions significantly affect the locally generated non-physical porosity. Inspired by Model I, a novel phase-field model, termed Model II, is proposed to protect interfacial consistency by decoupling the respective surface energy and grain boundary energy contributions to the total free energy of the system. The theoretical analysis of both Model I and Model II is also numerically confirmed. Finally, Model II is validated by comparing the phase-field dihedral angles and dynamic neck growth with the ones from analytical models and experiments. © 2022, The Authors. All rights reserved.

关键词： Microstructural evolution

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A versatile interferometric technique for probing the thermophysical properties of complex fluids

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Light(science & Applications) 2022年第5期11卷 979-990页

作者： Gopal Verma Gyanendra Yadav Chaudry Sajed Saraj Longnan Li Nenad Miljkovic Jean Pierre Delville Wei Li GPL Photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina School of Physical Sciences University of LiverpoolLiverpool L693BXUK Materials Research Laboratory University of IllinoisUrbanaILUSA Department of Mechanical Science and Engineering University of IllinoisUrbanaILUSA Department of Electrical and Computer Engineering University of IllinoisUrbanaILUSA International Institute for Carbon Neutral Energy Research(WPI-I2CNER) Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan University of Bordeaux CNRSLOMAUMR 5798F-33405 TalenceFrance

Laser-induced thermocapillary deformation of liquid surfaces has emerged as a promising tool to precisely characterize the thermophysical properties of pure ***,challenges arise for nanofluid(NF)and soft biofluid systems where the direct interaction of the laser generates an intriguing interplay between heating,momentum,and scattering forces which can even damage soft ***,we report a versatile,pump-probe-based,rapid,and non-contact interferometric technique that resolves interface dynamics of complex fluids with the precision of~1 nm in thick-film and 150 pm in thin-film regimes below the thermal limit without the use of lock-in or modulated *** characterize the thermophysical properties of complex NF in three exclusively different types of ***,when the NF is heated from the bottom through an opaque substrate,we demonstrate that our methodology permits the measurement of thermophysical properties(viscosity,surface tension,and diffusivity)of complex NF and ***,in a top illumination configuration,we show a precise characterization of NF by quantitively isolating the competing forces,taking advantage of the different time scales of these ***,we show the measurement of NF confined in a metal cavity,in which the transient thermoelastic deformation of the metal surface provides the properties of the NF as well as thermo-mechanical properties of the *** results reveal how the dissipative nature of the heatwave allows us to investigate thick-film dynamics in the thin-film regime,thereby suggesting a general approach for precision measurements of complex NFs,biofluids,and optofluidic devices.

关键词： deformation thermophysical film

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