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arXiv 2023年

作者： Zhang, Duo Liu, Xinzijian Zhang, Xiangyu Zhang, Chengqian Cai, Chun Bi, Hangrui Du, Yiming Qin, Xuejian Peng, Anyang Huang, Jiameng Li, Bowen Shan, Yifan Zeng, Jinzhe Zhang, Yuzhi Liu, Siyuan Li, Yifan Chang, Junhan Wang, Xinyan Zhou, Shuo Liu, Jianchuan Luo, Xiaoshan Wang, Zhenyu Jiang, Wanrun Wu, Jing Yang, Yudi Yang, Jiyuan Yang, Manyi Gong, Fu-Qiang Zhang, Linshuang Shi, Mengchao Dai, Fu-Zhi York, Darrin M. Liu, Shi Zhu, Tong Zhong, Zhicheng Lv, Jian Cheng, Jun Jia, Weile Chen, Mohan Ke, Guolin Weinan, E. Zhang, Linfeng Wang, Han AI for Science Institute Beijing100080 China DP Technology Beijing100080 China Academy for Advanced Interdisciplinary Studies Peking University Beijing100871 China State Key Lab of Processors Institute of Computing Technology Chinese Academy of Sciences Beijing100871 China University of Chinese Academy of Sciences Beijing100871 China HEDPS CAPT College of Engineering Peking University Beijing100871 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Chinese Academy of Sciences Ningbo315201 China School of Electronics Engineering and Computer Science Peking University Beijing100871 China Shanghai Engineering Research Center of Molecular Therapeutics & New Drug Development School of Chemistry and Molecular Engineering East China Normal University Shanghai200062 China Laboratory for Biomolecular Simulation Research Institute for Quantitative Biomedicine Department of Chemistry and Chemical Biology Rutgers University PiscatawayNJ08854 United States Department of Chemistry Princeton University PrincetonNJ08540 United States College of Chemistry and Molecular Engineering Peking University Beijing100871 China Yuanpei College Peking University Beijing100871 China School of Electrical Engineering and Electronic Information Xihua University Chengdu610039 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China Key Laboratory of Material Simulation Methods & Software of Ministry of Education College of Physics Jilin University Changchun130012 China International Center of Future Science Jilin University Changchun130012 China Key Laboratory for Quantum Materials of Zhejiang Province Department of Physics School of Science Westlake University Zhejiang Hangzhou310030 China Atomistic Simulations Italia

The rapid advancements in artificial intelligence (AI) are catalyzing transformative changes in atomic modeling, simulation, and design. AI-driven potential energy models have demonstrated the capability to conduct large-scale, long-duration simulations with the accuracy of ab initio electronic structure methods. However, the model generation process remains a bottleneck for large-scale applications. We propose a shift towards a model-centric ecosystem, wherein a large atomic model (LAM), pre-trained across multiple disciplines, can be efficiently fine-tuned and distilled for various downstream tasks, thereby establishing a new framework for molecular modeling. In this study, we introduce the DPA-2 architecture as a prototype for LAMs. Pre-trained on a diverse array of chemical and materials systems using a multi-task approach, DPA-2 demonstrates superior generalization capabilities across multiple downstream tasks compared to the traditional single-task pre-training and fine-tuning methodologies. Our approach sets the stage for the development and broad application of LAMs in molecular and materials simulation research. Copyright © 2023, The Authors. All rights reserved.

关键词： Multi-task learning

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Impact of helium pressure in arc plasma synthesis on crystallinity of single-walled carbon nanotubes

Impact of helium pressure in arc plasma synthesis on crystal...

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作者： Ando, Atsushi Takeda, Keigo Ohta, Takayuki Ito, Masafumi Hiramatsu, Mineo Ishikawa, Kenji Kondo, Hiroki Sekine, Makoto Suzuki, Tomoko Inoue, Sakae Ando, Yoshinori Hori, Masaru Department of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University Nagoya464-8603 Japan Department of Electrical and Electronic Engineering Faculty of Science and Technology Meijo University Nagoya468-8502 Japan Department of Material Science and Engineering Faculty of Science and Technology Meijo University Nagoya468-8502 Japan Institute of Innovation for Future Society Nagoya University Nagoya464-8603 Japan

Single-walled carbon nanotubes (SWNTs) were synthesized with a high growth rate by an arc plasma method employing the electrodes made from a Ni–Y mixture catalyst. In a previous study, it was reported that the monitoring of high-crystallinity SWNT growth enabled the evaluation of the results of the optical emission spectroscopy (OES) of C2, Ni, and Y. Here, the impact of helium pressure of arc plasma on the high crystallinity of SWNTs was determined by considering the high intensity ratios of catalytic metals over C2 emissions at low helium pressures in the arc plasma. © 2018 The Japan Society of Applied Physics.

关键词： Nanotubes

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Author Correction: Full reconstruction of simplicial complexes from binary contagion and Ising data

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Nature communications 2022年第1期13卷 3692页

作者： Huan Wang Chuang Ma Han-Shuang Chen Ying-Cheng Lai Hai-Feng Zhang The Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Mathematical Science Anhui University Hefei 230601 China. School of Internet Anhui University Hefei 230601 China. School of Physics and Material Science Anhui University Hefei 230601 China. School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ 85287 USA. The Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Mathematical Science Anhui University Hefei 230601 China. haifengzhang1978@***.

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Compliant lightweight non-invasive standalone“Marine Skin”tagging system

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npj Flexible Electronics 2018年第1期2卷 97-105页

作者： Joanna M.Nassar Sherjeel M.Khan Seneca J.Velling Andrea Diaz-Gaxiola Sohail F.Shaikh Nathan R.Geraldi Galo A.Torres Sevilla Carlos M.Duarte Muhammad M.Hussain mmh Labs Computer Electrical Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Material&Nanoscience Program Faculty of ScienceUniversity of WaterlooWaterlooON N2L-3G1Canada Red Sea Research Center(RSRC) Biological and Environmental Sciences and Engineering(BESE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia

Current marine research primarily depends on weighty and invasive sensory equipment and telemetric network to understand the marine environment,including the diverse fauna it contains,as a function of animal behavior and size,as well as equipment *** match animal morphology and activity within the surrounding marine environment,here we show a physically flexible and stretchable skin-like and waterproof autonomous multifunctional system,integrating Bluetooth,memory chip,and high performance physical *** sensory tag is mounted on a swimming crab(Portunus pelagicus)and is capable of continuous logging of depth,temperature,and salinity within the harsh ocean *** fully packaged,ultra-lightweight(<2.4 g in water),and compliant“Marine Skin”system does not have any wired connection enabling safe and weightless cuttingedge approach to monitor and assess marine life and the ecosystem’s health to support conservation and management of marine ecosystems.

关键词： Marine system Skin

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Evaluation of solar reference cells on a two-axis tracker using spectral measurements

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AIP Conference Proceedings 2022年第1期2445卷

作者： Frank Yignola Josh Peterson Rich Kessler Sean Snider Afshin Andreas Aron Habte Peter Gotseff Manajit Sengupta Fotis Mavromatakis 1Material Science Institute 1252 – University of Oregon Eugene Oregon 97403-1252 USA 2Saint Mary's High School 816 Black Oak Dr. Medford Oregon 97504 USA 3National Renewable Energy Laboratory 15013 Denver West Parkway Golden Colorado 80401 USA 4Department of Electrical and Computer Engineering Hellenic Mediterranean University 71410 Estavromenos Heraklion Crete Greece

A simple model calculating the performance of an IMT solar reference cell is proposed and tested under clear sky periods. One-minute data from EKO spectroradiometers collocated with an IMT reference cell are used for the analysis. Data are obtained at the NREL Solar Radiation Research Laboratory in Golden, Colorado and the UO Solar Radiation Monitoring Laboratory in Eugene, Oregon. The model is also applied and evaluated under cloudy conditions. A match of better than 1% is found between calculated clear sky values and IMT measurements for July, 2020. One- minute cloudy sky comparisons show a much larger variation, but when averaged over one hour, a standard deviation of 4% between the calculated and measured values is found.

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Lithography-free, planar IR polarization filters and converters via biaxial phonons in a-MoO3 flakes integrated into Fabry-Perot cavities

arXiv

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arXiv 2020年

作者： Dereshgi, Sina Abedini Folland, Thomas G. Murthy, Akshay A. Song, Xianglian Tanriover, Ibrahim Dravid, Vinayak P. Caldwell, Joshua D. Aydin, Koray Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37212 United States Department of Physics and Astronomy University of Iowa Iowa CityIA52242 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States International Institute for Nanotechnology Northwestern University EvanstonIL60208 United States International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education Engineering Technology Research Center for 2D material Information Function Devices and Systems of Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen518060 China Center Northwestern University EvanstonIL60208 United States

Exploiting polaritons in natural vdW materials has been successful in achieving extreme light confinement and low-loss optical interactions and enabling inherent simplified device integration. Recently, a-MoO3 has been reported as a semiconducting biaxial vdW material capable of sustaining naturally anisotropic phonon polariton modes in IR. In this study, we investigate the polarization-dependent optical characteristics of cavities formed using a-MoO3 to extend the degrees of freedom in the design of IR photonic components by tailoring the in-plane anisotropy of this material. Polarization-dependent absorption over 80% in a multilayer Fabry-Perot structure with a-MoO3 is reported without the need for nanoscale fabrication on the a-MoO3. We observe coupling between the a-MoO3 optical phonons and the Fabry-Perot cavity resonances. Using cross-polarized reflectance spectroscopy we show that the strong birefringence results in 15% of the total power converted into the orthogonal polarization with respect to incident wave. These findings can open new avenues in the quest for polarization filters and low-loss, integrated planar IR photonics and in dictating polarization control. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

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Determination of surface properties of Fe-C-Cr model alloys 27

Determination of surface properties of Fe-C-Cr model alloys

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27th International Conference on Metallurgy and materials, METAL 2018

作者： Novák, Vlastimil Řeháčková, Lenka Smetana, Bedřich Rosypalová, Silvie Drozdová, L'ubomíra Lichý, Petr Radkovský, Filip Konečná, Kateřina Litschmannová, Martina Dobrovská, Jana Faculty of Metallurgy and Materials Engineering VSB - Technical University of Ostrava Ostrava Czech Republic Regional Material Science and Technology Centre VSB - Technical University of Ostrava Ostrava Czech Republic Faculty of Electrical Engineering and Computer Science VSB - Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9788087294840

In this paper, the dependencies of density (ρ), surface tension (σ), and average wetting angles on temperature were investigated at three Fe - C - Cr model alloys where chromium content ranged from 0.92 to 4.76 wt%. All measurements were performed by sessile drop technique in a resistance furnace at temperatures from melting point up to 1600 °C. The effect of chromium, oxygen, and sulfur on the values of the abovementioned quantities was found. The temperature coefficient of surface tension dσ/dT was positive for all liquid metal samples due to the influence of surface active elements. The surface tension and average wetting angles raised with increasing chromium content. All obtained data were statistically evaluated with a satisfactory result. © 2018 TANGER Ltd., Ostrava.

关键词： Alumina

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First field-trial of a high capacity micro-comb based optical communications system 45

First field-trial of a high capacity micro-comb based optica...

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45th European Conference on Optical Communication, ECOC 2019

作者： Corcoran, Bill Tan, Mengxi Xu, Xingyuan Wu, Jiayang Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Boes, Andreas Mitchell, Arnan Moss, David J. Department of Electrical and Computer System Engineering Monash University Clayton Australia Centre for Micro-Photonics Swinburne University of Technology Hawthorn Australia School of Engineering RMIT University Melbourne Australia Department of Physics and Material Science City University of Hong Kong Hong Kong Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS Xi'an China INRS-Énergie Matériaux et Télécommunications Varennes Canada ITMO University St. Petersburg Russia Inst. of Fundamental and Frontier Sciences U. of Electronic Science and Tech. of China Chengdu China

ISBN: (纸本)9781839531859

We present the first demonstration of micro-comb based communications system in installed optical fibre. Robust soliton-crystal states enable open-loop control, and achieve 32.5 Tb/s (8.2 b/s/Hz spectral efficiency) over 72.8 km, providing a path to compact, high capacity transceivers for legacy fibre, metro-area systems. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Integrated optics

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Topological Unwinding in an Exciton-Polariton Condensate Array

arXiv

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arXiv 2023年

作者： Lyu, Guitao Minami, Yuki Kim, Na Young Byrnes, Tim Watanabe, Gentaro School of Physics Zhejiang Institute of Modern Physics Zhejiang University Zhejiang Hangzhou310027 China Division of Natural and Applied Sciences Duke Kunshan University Jiangsu Kunshan215300 China Faculty of Engineering Gifu University 1-1 Yanagido Gifu501-1193 Japan Institute for Quantum Computing University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada Waterloo Institute for Nanotechnology University of Waterloo 200 University Ave. West WaterlooONN2L 3G1 Canada New York University Shanghai NYU-ECNU Institute of Physics at NYU Shanghai Shanghai Frontiers Science Center of Artificial Intelligence and Deep Learning 567 West Yangsi Road Shanghai200126 China State Key Laboratory of Precision Spectroscopy School of Physical and Material Sciences East China Normal University Shanghai200062 China NYUAD Research Institute New York University Abu Dhabi United Arab Emirates Department of Physics New York University New YorkNY10003 United States Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang University Zhejiang Hangzhou310027 China

The phase distribution in a Bose-Einstein condensate can realize various topological states classified by distinct winding numbers. While states with different winding numbers are topologically protected in the linear Schrödinger equation, when nonlinearities are introduced, violations of the topological protection can occur, leading to unwinding. Exciton-polariton condensates constitute a nonlinear open-dissipative system that is well suited to studying such physics. Here we show that a one-dimensional array of exciton-polariton condensates displays a spontaneous phase unwinding from a πto zero-state. We clarify that this collective mode transition is caused by the combined effect of nonlinearity and topological defects in the condensates. While the mode-switching phenomenon observed in our previous experiment was interpreted as the single-particle mode competition, we offer an alternative explanation in terms the collective phase unwinding and find its evidence by reanalyzing the experimental data. Our results open a route towards active control of the mode switching by manipulating the topological defects in prospective quantum polaritonic devices. Copyright © 2023, The Authors. All rights reserved.

关键词： Winding

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Low-temperature magnetoresistance of (111) (La0.3Sr0.7)(Al0.65Ta0.35)O3/SrTiO3

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Physical Review B 2019年第3期99卷 035408-035408页

作者： V. V. Bal Z. Huang K. Han Ariando T. Venkatesan V. Chandrasekhar Department of Physics and Astronomy Northwestern University Evanston Illinois 60208 USA NUSNNI-Nanocore National University of Singapore 117411 Singapore Department of Physics National University of Singapore 117551 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 117456 Singapore Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Department of Material Science and Engineering National University of Singapore 117575 Singapore

The two-dimensional conducting interfaces in SrTiO3-based systems are known to show a variety of coexisting and competing phenomena in a complex phase space. Magnetoresistance measurements, which are typically used to extract information about the various interactions in these systems, must be interpreted with care, since multiple interactions can contribute to the resistivity in a given range of magnetic field and temperature. Here we review all the phenomena that can contribute to transport in SrTiO3-based conducting interfaces at low temperatures. We apply this understanding to the perpendicular magnetoresistance data of the high-mobility system of (111) oriented (La0.3Sr0.7)(Al0.65Ta0.35)O3/STO heterostructures, and find an excess negative magnetoresistance contribution which cannot be explained by weak localization alone. We argue that contributions from magnetic scattering as well as electron-electron interactions, combined with weak localization/antilocalization, can provide a possible explanation for the observed magnetoresistance.

关键词： Localization Magnetotransport Weak antilocalization Interfaces Transition metal oxides Two-dimensional electron gas

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