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Tunable charge to spin conversion in strontium iridate thin films

Physical Review Materials 2019年第5期3卷 051201(R)-051201(R)页

作者： Arnoud S. Everhardt Mahendra DC Xiaoxi Huang Shehrin Sayed Tanay A. Gosavi Yunlong Tang Chia-Ching Lin Sasikanth Manipatruni Ian A. Young Supriyo Datta Jian-Ping Wang Ramamoorthy Ramesh Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Materials Science and Engineering and Department of Physics University of California Berkeley California 94720 USA School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA Department of Electrical Engineering and Computer Science University of California Berkeley California 94720 USA School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA Components Research Intel Corporation Hillsboro Oregon 97124 USA Electrical and Computer Enginering Department University of Minnesota Minneapolis Minnesota 55455 USA

Efficient charge to spin conversion is important for low-power spin logic devices. Spin and charge interconversion is commonly performed using heavy metals and topological insulators, while the field of oxides is not yet fully explored. Strontium iridate thin films were grown, where the different crystal structures form a perfect playground to understand the key factors in obtaining high charge to spin conversion efficiency (i.e., large spin Hall angle). It was found that the semiconducting Sr2IrO4 has a spin Hall angle of ∼0.1 (depending on measurement technique), which is promising for a spin-orbit coupled electronic system and comparable to Pt. In contrast, the perovskite SrIrO3, reported to have a Dirac cone near the Fermi level, has a larger spin Hall angle of 0.3–0.4 degrees. The largest difference between the two materials is a large degree of spin-momentum locking in SrIrO3, comparable to known topological insulators. A simple semiclassical relationship is found where the spin Hall angle increases for higher degrees of spin-momentum locking and it also increases for lower Fermi wave vectors. This relationship is then able to explain the decreased spin Hall angle below 10 nm film thickness in SrIrO3, by relating it to the correspondingly higher carrier concentration (related to the higher Fermi wave vector). Breaking the commonly believed anticorrelation between resistivity and carrier concentration paves a pathway to lower power losses due to resistance while keeping large spin Hall angles.

关键词： Spin torque Spintronics Strongly correlated systems Thin films Weyl semimetal Laser ablation Transport techniques

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One-Shot Hybrid State Redistribution

arXiv

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arXiv 2020年

作者： Wakakuwa, Eyuri Nakata, Yoshifumi Hsieh, Min-Hsiu Department of Communication Engineering and Informatics Graduate School of Informatics and Engineering The University of Electro-Communications Tokyo182-8585 Japan Department of Computer Science Graduate School of Information Science and Technology The University of Tokyo Bunkyo-ku Tokyo113-8656 Japan Yukawa Institute for Theoretical Physics Kyoto university Kitashirakawa Oiwakecho Sakyo-ku Kyoto606-8502 Japan Photon Science Center Graduate School of Engineering The University of Tokyo Bunkyo-ku Tokyo113-8656 Japan JST PRESTO 4-1-8 Honcho Saitama Kawaguchi332-0012 Japan University of Technology Sydney SydneyNSW Australia Research Institute Taipei Taiwan

We consider state redistribution of a "hybrid" information source that has both classical and quantum components. The sender transmits classical and quantum information at the same time to the receiver, in the presence of classical and quantum side information both at the sender and at the decoder. The available resources are shared entanglement, and noiseless classical and quantum communication channels. We derive one-shot direct and converse bounds for these three resources, represented in terms of the smooth conditional entropies of the source state. Various coding theorems for two-party source coding problems are systematically obtained by reduction from our results, including the ones that have not been addressed in previous literatures. © 2020, CC BY.

关键词： Quantum entanglement

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Coherent mode-combined ultra-narrow-linewidth single-mode micro-disk laser

arXiv

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arXiv 2021年

作者： Lin, Jintian Farajollahi, Saeed Fang, Zhiwei Yao, Ni Gao, Renhong Guan, Jianglin Deng, Li Lu, Tao Wang, Min Zhang, Haisu Fang, Wei Qiao, Lingling Cheng, Ya Shanghai201800 China Department of Electrical and Computer Engineering University of Victoria VictoriaBCV8P 5C2 Canada XXL-The Extreme Optoelectromechanics Laboratory School of Physics and Electronic Science East China Normal University Shanghai200241 China Research Center for Intelligent Sensing Zhejiang Lab Hangzhou311100 China The Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou310027 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan250358 China

Integrated single-mode microlasers with ultra-narrow linewidths play a game-changing role in a broad spectrum of applications ranging from coherent communication and LIDAR to metrology and sensing. Generation of such light sources in a controllable and cost-effective manner remains an outstanding challenge due to the difficulties in the realization of ultrahigh Q active micro-resonators with suppressed mode numbers. Here, we report a microlaser generated in an ultra-high Q Erbium doped lithium niobate (LN) micro-disk. Through the formation of coherently combined polygon modes at both pump and laser wavelengths, the microlaser exhibits single mode operation with an ultra-narrow-linewidth of 98 Hz. In combination with the superior electro-optic and nonlinear optical properties of LN crystal, the mass-producible on-chip single-mode microlaser will provide an essential building block for the photonic integrated circuits demanding high precision frequency control and reconfigurability. © 2021, CC BY.

关键词： Optical properties

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Quantum Games and Interactive Tools for Quantum Technologies Outreach and Education

arXiv

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arXiv 2022年

作者： Seskir, Zeki C. Migdal, Piotr Weidner, Carrie Anupam, Aditya Case, Nicky Davis, Noah Decaroli, Chiara Ercan, İlke Foti, Caterina Gora, Pawel Jankiewicz, Klementyna La Cour, Brian R. Malo, Jorge Yago Maniscalco, Sabrina Naeemi, Azad Nita, Laurentiu Parvin, Nassim Scafirimuto, Fabio Sherson, Jacob F. Surer, Elif Wootton, James Yeh, Lia Zabello, Olga Chiofalo, Marilù Karlsruhe Institute of Technology ITAS Karlstraße 11 Karlsruhe76133 Germany Quantum Flytrap ul. Ceglowska 29 Warsaw01-809 Poland Quantum Engineering Technology Laboratories H.H. Wills Physics Laboratory Department of Electrical and Electronic Engineering University of Bristol BristolBS8 1FD United Kingdom Georgia Institute of Technology School of Literature Media and Communication 686 Cherry St NW AtlantaGA30313 United States The University of Texas at Austin Center for Quantum Research Applied Research Laboratories 10000 Burnet Rd AustinTX78758 United States National Quantum Computing Center Oxfordshire DidcotOX11 0GD United Kingdom TU Delft Department of Microelectronics Mekelweg 4 Delft2628 CD Netherlands QPlayLearn Aalto University InstituteQ - The Finnish Quantum Institute Department of Applied Physics AaltoFI-00076 11000 Finland Quantum AI Foundation Sanocka 9/103 Warsaw02-110 Poland University of Pisa Department of Physics Largo Bruno Pontecorvo 3 PisaI-56126 Italy University of Helsinki InstituteQ - The Finnish Quantum Institute Department of Physics Helsinki Finland Georgia Institute of Technology School of Electrical and Computer Engineering 777 Atlantic Drive NW AtlantaGA30332 United States Quarks Interactive Strada Bailor 93a Miercurea-Ciuc Harghita4500 Romania IBM Quantum IBM Research - Zurich Säumerstrasse 4 Rüschlikon8803 Switzerland ScienceAtHome Fuglesangs Allé 4 Aarhus8210 Denmark Aarhus University Institute for Physics and Astronomy Ny Munkegade 120 Aarhus8000 Denmark Middle East Technical University Graduate School of Informatics Department of Modeling and Simulation Üniversiteler Mah. Dumlupınar Blv. No:1 Ankara06800 Turkey University of Oxford Department of Computer Science Wolfson Building Parks Road OxfordOX1 3QD United Kingdom IBM Quantum IBM T. J. Watson Research Center Yorktown HeightsNY10598 United States Offenburg University of Applied Sciences Department of Business and Industrial Eng

In this article, we provide an extensive overview of a wide range of quantum games and interactive tools that have been employed by the community in recent years. The paper presents selected tools, as described by their developers. The list includes Hello Quantum, Hello Qiskit, Particle in a Box, Psi and Delta, QPlayLearn, Virtual Lab by Quantum Flytrap, Quantum Odyssey, scienceAtHome, and The Virtual Quantum Optics Laboratory. Additionally, we present events for quantum game development: hackathons, game jams, and semester projects. Furthermore, we discuss the Quantum Technologies Education for Everyone (QUTE4E) pilot project, which illustrates an effective integration of these interactive tools with quantum outreach and education activities. Finally, we aim at providing guidelines for incorporating quantum games and interactive tools in pedagogic materials to make quantum technologies more accessible for a wider population. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum optics

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Phase-Vortex Removal for Quantitative X-Ray Nanotomography with Near-Field Ptychography

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Physical Review Applied 2020年第6期14卷 064078-064078页

作者： Irene Zanette Richard Clare David Eastwood Charan Venkata Franz Pfeiffer Peter Cloetens Pierre Thibault Department of Physics and Astronomy University of Southampton Southampton SO17 1BJ United Kingdom Chair of Biomedical Physics Department of Physics and Munich School of BioEngineering Technical University of Munich Garching 85748 Germany Department of Electrical and Computer Engineering University of Canterbury Christchurch 8020 New Zealand School of Mechanical Aerospace and Civil Engineering The University of Manchester Manchester M13 9PL United Kingdom University of Manchester at Harwell Harwell Campus Didcot Oxfordshire OX11 0FA United Kingdom Diamond Light Source Harwell Science and Innovation Campus Didcot OX11 0DE United Kingdom Department of Physics and Astronomy University College London London WC1E 6BT United Kingdom European Synchrotron Radiation Facility Grenoble 38043 France Department of Physics University of Trieste Trieste 34123 Italy

X-ray ptychotomography in the near-field regime is a promising technique for high-resolution, quantitative, and nondestructive investigations in materials science, paleontology, and biomedicine. X-ray near-field ptychography has been previously demonstrated in projection and tomography mode, but the quantitativeness of the reconstructed data has never been discussed in detail. Here, we use measurements of a sample made of aluminum and nickel microparticles to evaluate the quantitativeness of the volumetric mass-density data. Moreover, we propose an algorithm (VortRem) for the removal of phase vortexes, a type of artifact that frequently occurs in holographic methods. VortRem and the results presented here may be fundamental for extending the applicability of this emerging technique to quantitative three-dimensional characterization studies of light as well as dense samples down to the nanoscale.

关键词： Interference & diffraction of light Microstructure Near-field optics Optical vortices Medical X-ray imaging X-ray holography X-ray imaging X-ray tomography

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Corrigendum to “Bifurcation and chaotic patterns of the chirped solitary waves in nonlinear electrical transmission line lattice” [Chaos Solitons Fractals 186 (2024) 115231]

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Chaos, Solitons & Fractals 2024年 186卷

作者： Alphonse Houwe Souleymanou Abbagari Lanre Akinyemi Serge Yamigno Doka Ahmed Sayed M. Metwally Hijaz Ahmad Department of Marine Engineering Limbé Nautical Arts and Fisheries Institute P.O. Box 485 Limbé Cameroon Department of Basic Science National Advanced School of Mines and Petroleum Industries The University of Maroua P.O. Box 08 Kaélé Cameroon Department of Mathematics Prairie View A&M University TX USA Department of Physics Faculty of Science The University of Ngaoundèré P.O. Box 454 Ngaoundèré Cameroon Department of Mathematics College of Science King Saud University Riyadh 11451 Saudi Arabia Near East University Operational Research Center in Healthcare TRNC Mersin 10 Nicosia 99138 Turkey Department of Computer Science and Mathematics Lebanese American University Beirut Lebanon

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A low cost method for determining the entire network path bandwidths of indirect high-performance computer networks 16

A low cost method for determining the entire network path ba...

引用

16th IEEE International Symposium on Parallel and Distributed Processing with Applications, 17th IEEE International Conference on Ubiquitous Computing and Communications, 8th IEEE International Conference on Big Data and Cloud Computing, 11th IEEE International Conference on Social Computing and Networking and 8th IEEE International Conference on Sustainable Computing and Communications, ISPA/IUCC/BDCloud/SocialCom/SustainCom 2018

作者： Yan, Baicheng Zhou, Yi Xiao, Limin Yang, Zhang Wu, Hongyu Wei, Bing School of Computer Science and Engineering Beihang University Beijing100191 China Institute of Applied Physics and Computational Mathematics Beijing100094 China

ISBN: (纸本)9781728111414

Bandwidth is an important performance metric for high-performance computer network (HINET). How to determine large-scale HINET path bandwidths quickly and precisely is a highly pivotal challenge for parallel application performance analysis and prediction, optimizing end-to-end data transport performance, network management, etc. However, it is hard to determine the entire network point-to-point bandwidths of HINET since it often costs amounts of measurement time. Existing path bandwidth measurement methods focus on improving the accuracy of single path bandwidth measurement, however, lack considerations for reducing the entire network path bandwidths measurement times. To address this issue, we present an efficient method to generate the full-scale point-to-point bandwidth measurement plan for rapidly obtaining each path bandwidth in HINET. For evaluating, a source routing Fat-tree simulator and comprehensive experiments were conducted for different application scenarios. Both experimental and analysis showed that our method can reduce the measurement times significantly. In particular, compared to the exhaustive method, the measurement times of our method are one in 185 for the entire path bandwidth fault and can save 95% measurement times in 1024 nodes network with synthetic traffic. © 2018 IEEE.

关键词： Bandwidth

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Identifying Laguerre-Gaussian Modes using Convolutional Neural Network

Identifying Laguerre-Gaussian Modes using Convolutional Neur...

引用

International Conference on Machine Learning and Applications (ICMLA)

作者： Safura Sharifi Yaser Banadaki Elisha Siddiqui Savannah Cuzzo Narayan Bhusal Lior Cohen Austin Kalasky Nik Prajapati Rachel Soto-Garcia Sofia Brown Irina Novikova Eugeniy Mikhailov Georgios Veronis Jonathan Dowling School of Electrical Engineering & Computer Science Center for Computation and Technology Hearne Institute for Theoretical Physics Louisiana State University Baton Rouge Louisiana USA School of Computer Science Southern University and A&M College Baton Rouge Louisiana USA Department of Physics College of William and Marry Williamburg Virginia USA

An automated determination of Laguerre-Gaussian (LG) modes benefits cavity tuning and optical communication. In this paper, we employ machine learning techniques to automatically detect the lowest sixteen LG modes of a laser beam. Convolutional neural networks (CNN) are trained by collecting the experimental and simulated datasets of LG modes that relies only on the intensity images of their unique patterns. We demonstrate that the trained CNN model can detect LG modes with the maximum accuracy greater than 96% after 60 epochs. The study evaluates the CNN's ability to generalize to new data and adapt to experimental conditions.

关键词： Laser beams Training Optical beams Laser modes Mathematical model Feature extraction Data models

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Roadmap on quantum nanotechnologies

arXiv

引用

arXiv 2021年

作者： Laucht, Arne Hohls, Frank Ubbelohde, Niels Fernando Gonzalez-Zalba, M. Reilly, David J. Stobbe, Søren Schröder, Tim Scarlino, Pasquale Koski, Jonne V. Dzurak, Andrew Yang, Chih-Hwan Yoneda, Jun Kuemmeth, Ferdinand Bluhm, Hendrik Pla, Jarryd Hill, Charles Salfi, Joe Oiwa, Akira Muhonen, Juha T. Verhagen, Ewold LaHaye, M.D. Kim, Hyun Ho Tsen, Adam W. Culcer, Dimitrie Geresdi, Attila Mol, Jan A. Mohan, Varun Jain, Prashant K. Baugh, Jonathan Centre for Quantum Computation and Communication Technology School of Electrical Engineering and Telecommunications UNSW SydneyNSW2052 Australia Physikalisch-Technische Bundesanstalt Braunschweig38116 Germany Quantum Motion Technologies Nexus Discovery Way LeedsLS2 3AA United Kingdom School of Physics University of Sydney SydneyNSW2006 Australia Microsoft Corporation Station Q Sydney University of Sydney SydneyNSW2006 Australia Department of Photonics Engineering DTU Fotonik Technical University of Denmark Building 343 Kgs. LyngbyDK-2800 Denmark Department of Physics Humboldt-Universität zu Berlin Berlin12489 Germany Department of Physics ETH Zürich ZürichCH-8093 Switzerland Niels Bohr Institute University of Copenhagen Copenhagen2100 Denmark JARA-FIT Institute for Quantum Information RWTH Aachen University and Forschungszentrum Jülich Aachen52074 Germany School of Physics University of Melbourne Melbourne Australia Department of Electrical and Computer Engineering The University of British Columbia VancouverBCV6T 1Z4 Canada The Institute of Scientific and Industrial Research Osaka University Ibaraki Osaka567-0047 Japan Center for Quantum Information and Quantum Biology Institute for open and Transdisciplinary Research Initiative Osaka University Osaka560-8531 Japan Center for Nanophotonics AMOLF Amsterdam1098 XG Netherlands School of Physics The University of New South Wales Sydney2052 Australia Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies UNSW Node The University of New South Wales Sydney2052 Australia QuTech and Kavli Institute of Nanoscience Delft University of Technology Delft2600 GA Netherlands School of Physics and Astronomy Queen Mary University of London E1 4NS United Kingdom Department of Materials Science and Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Chemistry University of Illinois at Urbana-Champaign Urbana

Quantum phenomena are typically observable at length and time scales smaller than those of our everyday experience, often involving individual particles or excitations. The past few decades have seen a revolution in the ability to structure matter at the nanoscale, and experiments at the single particle level have become commonplace. This has opened wide new avenues for exploring and harnessing quantum mechanical effects in condensed matter. These quantum phenomena, in turn, have the potential to revolutionize the way we communicate, compute and probe the nanoscale world. Here, we review developments in key areas of quantum research in light of the nanotechnologies that enable them, with a view to what the future holds. Materials and devices with nanoscale features are used for quantum metrology and sensing, as building blocks for quantum computing, and as sources and detectors for quantum communication. They enable explorations of quantum behaviour and unconventional states in nano- and opto-mechanical systems, low-dimensional systems, molecular devices, nano-plasmonics, quantum electrodynamics, scanning tunnelling microscopy, and more. This rapidly expanding intersection of nanotechnology and quantum science/technology is mutually beneficial to both fields, laying claim to some of the most exciting scientific leaps of the last decade, with more on the horizon. © 2021, CC BY.

关键词： Quantum computers

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Computational framework for polymer synthesis to study dielectric properties using polarizable reactive molecular dynamics

arXiv

引用

arXiv 2020年

作者： Mishra, Ankit Chen, Lihua Li, ZongZe Nomura, Ken-Ichi Krishnamoorthy, Aravind Fukushima, Shogo Tiwari, Subodh C. Kalia, Rajiv K. Nakano, Aiichiro Ramprasad, Rampi Sotzing, Greg Cao, Yang Shimojo, Fuyuki Vashishta, Priya Collaboratory for Advanced Computing and Simulations University of Southern California Los AngelesCA90089-0242 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Electrical and Computer Engineering Department of Chemistry University of Connecticut StorrsCT06269 United States Department of Physics Kumamoto University Kumamoto860-8555 Japan

The increased energy and power density required in modern electronics poses a challenge for designing new dielectric polymer materials with high energy density while maintaining low loss at high applied electric fields. Recently, an advanced computational screening method coupled with hierarchical modelling has accelerated the identification of promising high energy density materials. It is well known that the dielectric response of polymeric materials is largely influenced by their phases and local heterogeneous structures as well as operational temperature. Such inputs are crucial to accelerate the design and discovery of potential polymer candidates. However, an efficient computational framework to probe temperature dependence of the dielectric properties of polymers, while incorporating effects controlled by their morphology is still lacking. In this paper, we propose a scalable computational framework based on reactive molecular dynamics with a valence-state aware polarizable charge model, which is capable of handling practically relevant polymer morphologies and simultaneously provide near-quantum accuracy in estimating dielectric properties of various polymer systems. We demonstrate the predictive power of our framework on high energy density polymer systems recently identified through rational experimental-theoretical co-design. Our scalable and automated framework may be used for high-throughput theoretical screenings of combinatorial large design space to identify next-generation high energy density polymer materials. © 2020, CC-BY.

关键词： Temperature distribution

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