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Electronic structure of the dilute magnetic semiconductor Ga1-xMnxP from hard X-ray photoelectron spectroscopy and hard X-ray angle-resolved photoemission

arXiv

引用

arXiv 2018年

作者： Keqi, A. Gehlmann, M. Conti, G. Nemšák, S. Rattanachata, A. Minár, J. Plucinski, L. Rault, J.E. Rueff, J.P. Scarpulla, M. Hategan, M. Pálsson, G.K. Conlon, C. Eiteneer, D. Saw, A.Y. Gray, A.X. Kobayashi, K. Ueda, S. Dubon, O.D. Schneider, C.M. Fadley, C.S. Department of Physics University of California Davis DavisCA95616 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Peter-Grünberg-Institut PGI-6 Forschungszentrum Jülich Jülich52425 Germany New Technologies-Research Center University of West Bohemia Pilsen306 14 Czech Republic Synchrotron SOLEIL Saint-Aubin91192 France Department of Material Science and Engineering University of California Berkeley BerkeleyCA94720 United States Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States Department of Physics Uppsala University UppsalaSE-751 20 Sweden Department of Physics Temple University PhiladelphiaPA19122 United States Japan Atomic Energy Agency 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo679-5148 Japan 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo679-5148 Japan Research Center for Advanced Measurement and Characterization NIMS 1-2-1 Sengen TsukubaIbaraki305-0047 Japan

We have investigated the electronic structure of the dilute magnetic semiconductor (DMS) Ga0.98Mn0.02P and compared it to that of an undoped GaP reference sample, using hard X-ray photoelectron spectroscopy (HXPS) and hard X-ray angle-resolved photoemission spectroscopy (HARPES) at energies of about 3 keV. We present experimental data, as well as theoretical calculations, in order to understand the role of the Mn dopant in the emergence of ferromagnetism in this material. Both core-level spectra and angle-resolved or angle-integrated valence spectra are discussed. In particular, the HARPES experimental data are compared to free-electron final-state model calculations and to more accurate one-step photoemission theory. The experimental results show differences between Ga0.98Mn0.02P and GaP in both angle-resolved and angle-integrated valence spectra. The Ga0.98Mn0.02P bands are broadened due to the presence of Mn impurities that disturb the long-range translational order of the host GaP crystal. Mn-induced changes of the electronic structure are observed over the entire valence band range, including the presence of a distinct impurity band close to the valence-band maximum of the DMS. These experimental results are in good agreement with the one-step photoemission calculations, and a prior HARPES study of Ga0.97Mn0.03As and GaAs (Gray et al. Nature Materials 11, 957 (2012)), demonstrating the strong similarity between these two materials. The Mn 2p and 3s core-level spectra also reveal an essentially identical state in doping both GaAs and GaP. Copyright © 2018, The Authors. All rights reserved.

关键词： III-V semiconductors

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Discovery of a high-altitude ecotype and ancient lineage of Arabidopsis thaliana from Tibet

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science Bulletin 2017年第24期62卷 1628-1630页

作者： Liyan Zeng Zhuoya Gu Min Xu Ning Zhao Weidong Zhu Takahiro Yonezawa Tianmeng Liu Lha Qiong Tashi Tersing Lingli Xu Yang Zhang Rongyan Xu Ningyu Sun Yanyan Huang Jiankun Lei Liang Zhang Feng Xie Fang Zhang Hongya Gu Yupeng Geng Masami Hasegawa Ziheng Yang M. James C. Crabbe Fan Chen Yang Zhong Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life Sciences Fudan University Shanghai 200433 China Shanghai Public Health Clinical Center Fudan University Shanghai 201508 China Institute of Biodiversity Science and Geobiology College of Sciences Tibet University Lhasa 850000 China Institute of Forest Inventory Planning and Research of Tibet Autonomous Region Lhasa 850010 China Three Gorges Center for Food and Drug Control Yichang 443005 China Institute of Mathematical Statistics Midori-cho 10-3 Tachikawa Tokyo 190-8562 Japan Tibet Museum of Natural Science Lhasa 850000 China h Department of Bioengineering University of Illinois at Urbana-Champaign Champaign IL 61801 USA Department of Bioengineering University of Illinois at Urbana-Champaign Champaign IL 61801 USA School of Computer Science Fudan University Shanghai 200433 China School of Urban Rail Transportation Soochow University Suzhou 215131 China Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China School of Life Sciences Peking University Beijing 100871 China School of Life Sciences Yunnan University Kunming 650091 China Department of Genetics Evolution and Environment University College London Darwin Building Cower Street London WCIE 6BT United Kingdom Department of Zoology University of Oxford Tinbergen Building South Parks Road Oxford OX1 3PS United Kingdom Institute of Biomedical and Environmental Science & Technology Department of Life Sdences University of Bedfordshire Park Square Luton LU1 3JU United Kingdom Shanghai Center for Bioinformation Technology Shanghai 201203 China

Arabidopsis thaliana（A, thaliana） has long been a model species for dicotyledon study, and was the first flowering plant to get its genome completed sequenced . Although most wild A. thaliana are collected in Europe, several studies have found a rapid A. thaliaria west-east expansion from Central Asia . The Qinghai-Tibet Plateau （QTP） is close to Central Asia and known for its high altitude, unique environments and biodiversity . However, no wild-type A. thaliana had been either discovered or sequenced from QTP. Studies on the A. thaliana populations collected under 2000 m asl have shown that the adaptive variations associated with climate and altitudinal gradients .

关键词： Discovery a high-altitude ecotype ancient lineage of Arabidopsis thaliana from Tibet

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Collective circular motion and cooperative circumnavigation for nonholonomic mobile robots using range-based measurements

Collective circular motion and cooperative circumnavigation ...

引用

AIAA Guidance, Navigation, and control Conference, 2016

作者： Cao, Yongcan Milutinovic, Dejan Casbeer, David Kingston, Derek Department of Electrical and Computer Engineering University of Texas San AntonioTX78249 United States Department of Computer Engineering University of California Santa CruzCA95064 United States Control Science Center of Excellence Air Force Research Laboratory WPAFB OH45433 United States

ISBN: (数字)9781624103896

ISBN: (纸本)9781624103896

In this paper, we study two typical collective behaviors, namely, collective circular motion and cooperative circumnavigation, for a team of nonholonomic mobile robots when only range-based measurements are available. The main challenge is the development of control algorithms using range measurements rather than position measurements. For the collective circular motion, the goal is to design control algorithms such that a team of robots evenly spreads over the circle of a desired radius, which is centered at a stationary target. For the cooperative circumnavigation motion, the goal is to develop control strategies such that a robot can orbit around a stationary target at a desired distance that is larger than the maximum communication range between the robot and the target. To accomplish this goal, we first let a few other "relay" robots maintain the collective circular motion by using the developed control aglorithm and then compute the distance between the robot and the target using auxilliary range measurements between "relay" robots and the robot (or the target). Finally, the distance between the robot and the target is used to enable the circumnavigation of the robot around the target at the desired radius. To further demonstrate the effectiveness of the developed control algorithms and strategies, simulation examples are provided as a proof of concept. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Cooperative communication

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An event-triggered consensus approach for distributed clock synchronization

An event-triggered consensus approach for distributed clock ...

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American control Conference

作者： Eloy Garcia Shaoshuai Mou Yongcan Cao David W. Casbeer Control Science Center of Excellence Air Force Research Laboratory WPAFB OH 45433 United States of America School of Aeronautics and Astronautics Purdue University West Lafayette IN 47907 United States of America Department of Electrical and Computer Engineering University of Texas at San Antonio 78249 United States of America

ISBN: (纸本)9781509045839

Distributed clock synchronization with intermittent communication is addressed in this paper. An event-triggered control and communication approach is presented in order to determine in a decentralized way the time instants at which each agent transmits information. The decentralized event-triggered synchronization of clocks is formulated as a single integrator consensus problem in the particular case and as double integrator consensus problem in the general case. The main contribution of this paper, besides the implementation of event-triggered mechanisms, is the feature that the virtual clocks are continuous. This is an important property because of the processes associated to each local clock, where missing deadlines or performing time dependent tasks more than once needs to be avoided.

关键词： clock recovery Event trigger local clock Timing devices integrators

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controlling the magnetic anisotropy in epitaxial Y3Fe5O12 films by manganese doping

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Physical Review B 2017年第22期96卷 224403-224403页

作者： C. T. Wang X. F. Liang Y. Zhang X. Liang Y. P. Zhu J. Qin Y. Gao B. Peng N. X. Sun L. Bi National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu 610054 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu 610054 China Department of Electrical and Computer Engineering Northeastern University 360 Huntington Avenue Boston Massachusetts 02115 USA Winchester Technologies LLC Burlington Massachusetts 01803 USA

controlling the magnetic anisotropy in epitaxial Y3Fe5O12 (YIG) thin films is critical for magnonic and photonic device applications. In this paper, we report the crystal structure, magnetic properties, and magnetic anisotropy of epitaxial Y3(Fe5−xMnx)O12 (Mn:YIG) thin films grown on Gd3Ga5O12 (111) (GGG) substrates by pulsed-laser deposition. Mn doping is observed to strongly enhance the magnetoelastic coefficient of YIG thin films, which leads to large tunability of the thin film magnetic anisotropy by lattice strain. With increasing Mn concentration from x=0 to x=1.25, a continuous increase of out-of-plane magnetic anisotropy ranging from −644.4 Oe to 1337.5 Oe is observed. In particular, a perpendicular magnetic anisotropy (PMA) is achieved in Mn:YIG thin films with a high Mn concentration of x=1.12. Ferromagnetic resonance (FMR) measurements show low FMR linewidths of 3.4 Oe to 129 Oe at 9.5 GHz in Mn:YIG thin films. Our paper demonstrates manganese doping as an effective way to enhance the magnetoelastic anisotropy of YIG thin films by strain, which is useful for magnonic and magneto-optical device applications.

关键词： Jahn-Teller effect Magnetic anisotropy Magnetoelastic effect Spintronics

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Experimental demonstration of quantum fully homomorphic encryption with application in a two-party secure protocol

arXiv

引用

arXiv 2018年

作者： Tham, W.K. Ferretti, Hugo Bonsma-Fisher, Kent Brodutch, Aharon Sanders, Barry C. Steinberg, Aephraim M. Jeery, Stacey Department of Physics University of Toronto 60 St George St TorontoONM5S 1A7 Canada Center for Quantum Information and Quantum Control University of Toronto 60 St George St Toronto OntarioM5S 1A7 Canada Edward S. Rogers Department of Electrical and Computer Engineering University of Toronto 10 Kings College Road TorontoONM5S 3G4 Canada Institute for Quantum Science and Technology University of Calgary AlbertaT2N 1N4 Canada Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada QuSoft and Cwi Amsterdam Netherlands

A fully homomorphic encryption system hides data from unauthorized parties, while still allowing them to perform computations on the encrypted data. Aside from the straightforward benefit of allowing users to delegate computations to a more powerful server without revealing their inputs, a fully homomorphic cryptosystem can be used as a building block in the construction of a number of cryptographic functionalities. Designing such a scheme remained an open problem until 2009, decades after the idea was first conceived, and the past few years have seen the generalization of this functionality to the world of quantum machines. Quantum schemes prior to the one implemented here were able to replicate some features in particular use-cases often associated with homomor-phic encryption but lacked other crucial properties, for example, relying on continual interaction to perform a computation or leaking information about the encrypted data. We present the first experimental realisation of a quantum fully homomorphic encryption scheme. We further present a toy two-party secure computation task enabled by our scheme. Finally, as part of our implemen-tation, we also demonstrate a post-selective two-qubit linear optical controlled-phase gate with a much higher post-selection success probability (1/2) when compared to alternate implementations, e.g. with post-selective controlled-Z or controlled-X gates (1/9). Copyright © 2018, The Authors. All rights reserved.

关键词： Toys

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Author Correction: Ultra-thin high-efficiency mid-infraredtransmissive Huygens meta-optics

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Nature communications 2018年第1期9卷 2399页

作者： Li Zhang Jun Ding Hanyu Zheng Sensong An Hongtao Lin Bowen Zheng Qingyang Du Gufan Yin Jerome Michon Yifei Zhang Zhuoran Fang Mikhail Y Shalaginov Longjiang Deng Tian Gu Hualiang Zhang Juejun Hu State Key Laboratory of Electronic Thin Films and Integrated Devices National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of China Chengdu Sichuan 611731 China. Department of Materials Science & Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA. School of Information and Science Technology East China Normal University Shanghai 200062 China. Department of Electrical & Computer Engineering University of Massachusetts Lowell Lowell MA 01854 USA. Department of Materials Science & Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA. gutian@mit.edu. Department of Electrical & Computer Engineering University of Massachusetts Lowell Lowell MA 01854 USA. hualiang_zhang@uml.edu. Department of Materials Science & Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA. hujuejun@mit.edu.

The original version of this Article omitted the following from the Acknowledgements:'J.D. and H. Zhang acknowledge initial funding for design of the meta-atoms provided by the National science Foundation under award CMMI-1266251. Z.L. and H. Zheng contributed to the Device Fabrication section and were independently funded as visiting scholars by the National Natural science Foundation of China under award 51772042 and the "111" project (No. B13042) led by Professor Huaiwu Zhang. Later work contained within the Device Modeling and Device Characterization sections and some revisions to the manuscript were funded under Defense Advanced research Projects Agency Defense sciences Office (DSO) Program: EXTREME Optics and Imaging (EXTREME) under Agreement No. HR00111720029. The authors also acknowledge fabrication facility support by the Harvard University center for Nanoscale Systems funded by the National science Foundation under award 0335765. The views, opinions and/or findings expressed are those of the authors and should not be interpreted as representing the official views or policies of the department of Defense or the U.S. Government.' This has been corrected in both the PDF and HTML versions of the Article.

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3D Mesostructures: Fabrication and Deformation of 3D Multilayered Kirigami Microstructures (Small 11/2018)

引用

Small 2018年第11期14卷

作者： Mohammad Humood Yan Shi Mengdi Han Joseph Lefebvre Zheng Yan Matt Pharr Yihui Zhang Yonggang Huang John A. Rogers Andreas A. Polycarpou Department of Mechanical Engineering College of Engineering Texas A&M University College Station TX 77843-3123 USA State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China Center for Mechanics and Materials and Center for Flexible Electronics Technology AML Department of Engineering Mechanics Tsinghua University Beijing 100084 P. R. China Department of Materials Science and Engineering Fredrick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 USA Bruker Nano Surfaces Eden Prairie MN 55344 USA Department of Chemical Engineering and Department of Mechanical and Aerospace Engineering University of Missouri Columbia MI 65211 USA Departments of Mechanical Engineering and Civil and Environmental Engineering Northwestern University Evanston IL 60208 USA Department of Biomedical Engineering Department of Chemistry Department of Mechanical Engineering Department of Electrical Engineering and Department of Computer Science Center for Bio-Integrated Electronics Simpson Querrey Institute for Nano/Biotechnology Northwestern University Evanston IL 60208 USA

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P1-559: TOWARD PERCEPTUAL DEEP LEARNING–BASED ABNORMAL BEHAVIOR PATTERN ANALYSIS FOR PATIENTS WITH ALZHEIMER'S DISEASE

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Alzheimer's & Dementia 2018年第7S_PART_10期14卷

作者： Jeonghwan Gwak Jong-In Song Kiseon Kim Moongu Jeon Cheolbin Park Hyunsu Jeong Kyu Yeong Choi Jung Eun Park Jung Sup Lee Byeong Chae Kim Kun Ho Lee Biomedical Research Institute & Department of Radiology Seoul National University Hospital Seoul Republic of South Korea School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology Gwangju Republic of South Korea Department of Premedics Chosun University Gwangju Republic of South Korea BK21-plus Research Team for Bioactive Control Technology Chosun University Gwangju Republic of South Korea Department of Life Science Chosun University Gwangju Republic of South Korea Department of Biomedical Science Chosun University Gwangju Republic of South Korea National Research Center for Dementia Chosun University Gwangju Republic of South Korea Department of Neurology Chonnam National University Medical School Gwangju Republic of South Korea

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TOWARD PERCEPTUAL DEEP LEARNING–BASED ABNORMAL BEHAVIOR PATTERN ANALYSIS FOR PATIENTS WITH ALZHEIMER’S DISEASE

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Alzheimer's & Dementia 2018年第7期14卷 P548-P548页

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