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N superlattice multilayer: A real optical mode ferromagnetic resonance thick-film

Applied Physics letters 2020年第15期116卷

作者： du, Honglei Xue, Qian li, Shandong Miao, Guo-Xing Chu, Xian-Ming dai, Youyong Yu, Meijie Zhao, Guoxia Yan, Shishen School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan250100 China College of Physics Center for Marine Observation and Communication Qingdao University Qingdao266071 China Institute for Quantum Computing Department of Electrical and Computer Engineering University of Waterloo WaterlooN2L3G1 Canada Department of Cardiology Affiliated Hospital Qingdao University Qingdao266071 China School of Materials Science and Engineering Shandong University Jinan250100 China Spintronics Institute University of Jinan Jinan250022 China

A pure optical mode (OM) resonance with ultrahigh resonance frequency (f r O) and permeability μ at zero bias field was observed in 50-nm FeCoB/Ru/FeCoB sandwich trilayers due to the presence of strong antiferromagnetic interlayer exchange coupling. However, the necessary thickness for creating practical microwave devices cannot be readily achieved by increasing the FeCoB layer thickness or stacking FeCoB/Ru units due to dramatically deteriorated high-frequency performance. In this study, several 50-nm FeCoB/Ru/FeCoB OM units were stacked to form a superlattice structure, with 10-nm ZnO insulator spacers separating the units. It is interesting that the superlattice multilayers not only retain excellent high-frequency OM resonance performance comparable to the single OM unit but also increase the effective magnetic film thickness by a factor of 5. This can be attributed to the positive superposition of the almost identical OM units as well as the effective decoupling between them by thick ZnO spacers. This study provides a promising way to fabricate thicker films while still maintaining excellent OM resonance performance. © 2020 Author(s).

关键词： Zinc oxide

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THz generation by exchange-coupled spintronic emitters

npj Spintronics

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npj Spintronics 2024年第1期2卷 1-8页

作者： Roman Adam derang Cao daniel E. Bürgler Sarah Heidtfeld Fangzhou Wang Christian Greb Markus Büscher Claus M. Schneider Jing Cheng debamitra Chakraborty Ivan Komissarov Roman Sobolewski Martin Mikulics Hilde Hardtdegen Peter Grünberg Institute Research Centre Jülich Jülich Germany College of Physics Qingdao University Qingdao China Faculty of Physics University Duisburg-Essen Duisburg Germany Institut für Laser- und Plasmaphysik Heinrich-Heine Universität Düsseldorf Düsseldorf Germany Materials Science Graduate Program University of Rochester Rochester NY USA Laboratory for Laser Energetics University of Rochester Rochester NY USA Department of Electrical and Computer Engineering University of Rochester Rochester NY USA Ernst Ruska Centre Research Centre Jülich Jülich Germany

The mechanism of THz generation in ferromagnet/metal (F/M) bilayers has been typically ascribed to the inverse spin Hall effect (ISHE). Here, we fabricated Pt/Fe/Cr/Fe/Pt multilayers containing two back-to-back spintronic THz emitters separated by a thin (tCr≤ 3nm) wedge-shaped Cr spacer. In such an arrangement, magnetization alignment of the two Fe films can be controlled by the interplay between Cr-mediated interlayer exchange coupling (IEC) and an external magnetic field. This in turn results in a strong variation of the THz amplitudeA, withA↑↓reaching up to 14 timesA↑↑(arrows indicate the relative alignment of the magnetization of the two magnetic layers). This observed functionality is ascribed to the interference of THz transients generated by two closely spaced THz emitters. Moreover, the magnetic field dependenceA(H) shows a strong asymmetry that points to an additional performance modulation of the THz emitter via IEC and multilayer design.

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Preface

Lecture Notes on Data Engineering and Communications Technol...

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lecture Notes on data engineering and Communications Technologies 2020年 36卷 vii页

作者： Vasudevan, Hari Gajic, Zoran deshmukh, Amit A. D.J. Sanghvi College of Engineering MumbaiMaharashtra India Department of Electrical and Computer Engineering Rutgers University PiscatawayNJ United States

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deformation versus Sphericity in the Ground States of the lightest Gold Isotopes

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Physical Review letters 2023年第20期131卷 202501-202501页

作者： J. G. Cubiss A. N. Andreyev A. E. Barzakh P. Van duppen S. Hilaire S. Péru S. Goriely M. Al Monthery N. A. Althubiti B. Andel S. Antalic d. Atanasov K. Blaum T. E. Cocolios T. day Goodacre A. de Roubin G. J. Farooq-Smith d. V. Fedorov V. N. Fedosseev d. A. Fink l. P. Gaffney l. Ghys R. d. Harding M. Huyse N. Imai d. T. Joss S. Kreim d. lunney K. M. lynch V. Manea B. A. Marsh Y. Martinez Palenzuela P. l. Molkanov d. Neidherr G. G. O’Neill R. d. Page S. d. Prosnyak M. Rosenbusch R. E. Rossel S. Rothe l. Schweikhard M. d. Seliverstov S. Sels l. V. Skripnikov A. Stott C. Van Beveren E. Verstraelen A. Welker F. Wienholtz R. N. Wolf K. Zuber School of Physics Engineering and Technology University of York York YO10 5DD United Kingdom Advanced Science Research Center (ASRC) Japan Atomic Energy Agency Tokai-mura Japan Affiliated with an institute covered by a cooperation agreement with CERN KU Leuven Instituut voor Kern- en Stralingsfysica 3001 Leuven Belgium Université Paris-Saclay CEA LMCE 91680 Bruyères-le-Châtel France Institut d’Astronomie et d’Astrophysique CP-226 Université Libre de Bruxelles 1050 Brussels Belgium The University of Manchester Department of Physics and Astronomy Oxford Road M13 9PL Manchester United Kingdom Physics Department College of Science Jouf University Sakakah Kingdom of Saudi Arabia Department of Nuclear Physics and Biophysics Comenius University in Bratislava 84248 Bratislava Slovakia Max-Planck-Institut für Kernphysik Saupfercheckweg 1 69117 Heidelberg Germany CERN 1211 Geneva 23 Switzerland Center for Nuclear Study (CNS) Graduate School of Science The University of Tokyo Japan Department of Physics University of Liverpool Liverpool L69 7ZE United Kingdom CSNSM-CNRS Université de Paris Sud 91400 Orsay France GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt 64291 Germany Institut für Physik Universität Greifswald 17487 Greifswald Germany Institut für Physik Johannes Gutenberg-Universität Mainz Mainz D-55128 Germany Institut für Kern- und Teilchenphysik Technische Universität Dresden Dresden 01069 Germany

The changes in mean-squared charge radii of neutron-deficient gold nuclei have been determined using the in-source, resonance-ionization laser spectroscopy technique, at the ISOldE facility (CERN). From these new data, nuclear deformations are inferred, revealing a competition between deformed and spherical configurations. The isotopes Au180,181,182 are observed to possess well-deformed ground states and, when moving to lighter masses, a sudden transition to near-spherical shapes is seen in the extremely neutron-deficient nuclides, Au176,177,179. A case of shape coexistence and shape staggering is identified in Au178 which has a ground and isomeric state with different deformations. These new data reveal a pattern in ground-state deformation unique to the gold isotopes, whereby, when moving from the heavy to light masses, a plateau of well-deformed isotopes exists around the neutron midshell, flanked by near-spherical shapes in the heavier and lighter isotopes—a trend hitherto unseen elsewhere in the nuclear chart. The experimental charge radii are compared to those from Hartree-Fock-Bogoliubov calculations using the d1M Gogny interaction and configuration mixing between states of different deformation. The calculations are constrained by the known spins, parities, and magnetic moments of the ground states in gold nuclei and show a good agreement with the experimental results.

关键词： Electronic excitation & ionization Nuclear charge radii laser spectroscopy 150 ≤ A ≤ 189 190 ≤ A ≤ 219 Magnetic moment density functional theory Hartree-Fock methods

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Automated Verification System for Functional Coverage Extraction 2

Automated Verification System for Functional Coverage Extrac...

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2nd International Conference on Electronics, Communication and Aerospace Technology, ICECA 2018

作者： Jain, Palak Shah, Mihir V. Patel, Bhavin Electronics and Communication Dept. L. D. College of Engineering Ahmedabad India Senior Engineer Einfochips Ahmedabad India

ISBN: (纸本)9781538609651

With the increasing complexities of semiconductor designs, verification becomes more critical and time consuming. ASIC verification consumes 60 to 70 percent of the entire product cycle and hence it is a very important task in digital design world. To reduce the overall time to market, it is crucial to complete the verification in a narrow time frame. Coverage gives the statistical measure of the verification objectives that have been met. The objective of this paper is to automate the creation of coverage model from the coverage plan, thus reducing the verification efforts and increasing the verification productivity. © 2018 IEEE.

关键词： Product design

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Extreme events in quantum cascade lasers

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Advanced Photonics 2020年第6期2卷 57-68页

作者： Olivier Spitz Jiagui Wu Andreas Herdt Grégory Maisons Mathieu Carras Wolfgang Elsäßer Chee-Wei Wong Frédéric Grillot LTCI Télécom ParisInstitut Polytechnique de ParisPalaiseauFrance mirSense Centre d’Intégration NanoInnovPalaiseauFrance University of California Los Angeles Fang Lu Mesoscopic Optics and Quantum Electronics LaboratoryLos AngelesCaliforniaUnited States Southwest University College of Electronic and Information EngineeringChongqingChina Technische Universität Darmstadt DarmstadtGermany University of New Mexico Center for High Technology MaterialsAlbuquerqueNew MexicoUnited States

We demonstrate experimentally that mid-infrared quantum cascade lasers(QCls)operating under external optical feedback exhibit extreme *** events can be triggered by adding small amplitude periodic modulation,with the highest success rate for the case of a pulse-up *** findings broaden the potential applications for QCls,which have already been proven to be a semiconductor laser of interest for spectroscopic applications and countermeasure *** ability to trigger extreme events paves the way for optical neuron-like systems where information propagates as a result of high intensity bursts.

关键词： extreme pulses quantum cascade lasers nonlinear dynamics mid-infrared photonics

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The state-of-the-art in Cardiac MRI Reconstruction: Results of the CMRxRecon Challenge in MICCAI 2023

arXiv

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arXiv 2024年

作者： lyu, Jun Qin, Chen Wang, Shuo Wang, Fanwen li, Yan Wang, Zi Guo, Kunyuan Ouyang, Cheng Tänzer, Michael liu, Meng Sun, longyu Sun, Mengting li, Qin Shi, Zhang Hua, Sha li, Hao Chen, Zhensen Zhang, Zhenlin Xin, Bingyu Metaxas, dimitris N. Yiasemis, George Teuwen, Jonas Zhang, liping Chen, Weitian Pang, Yanwei liu, Xiaohan Razumov, Artem dylov, dmitry V. dou, Quan Yan, Kang Xue, Yuyang du, Yuning dietlmeier, Julia Garcia-Cabrera, Carles Hemidi, Ziad Al-Haj Vogt, Nora Xu, Ziqiang Zhang, Yajing Chu, Ying-Hua Chen, Weibo Bai, Wenjia Zhuang, Xiahai Qin, Jing Wu, lianmin Yang, Guang Qu, Xiaobo Wang, He Wang, Chengyan Psychiatry Neuroimaging Laboratory Brigham and Women’s Hospital Harvard Medical School 399 Revolution Drive BostonMA02215 United States Department of Electrical and Electronic Engineering & I-X Imperial College London United Kingdom Digital Medical Research Center School of Basic Medical Sciences Fudan University Shanghai China Department of Bioengineering & I-X Imperial College London LondonW12 7SL United Kingdom Cardiovascular Magnetic Resonance Unit Royal Brompton Hospital Guy’s and St Thomas’ NHS Foundation Trust LondonSW3 6NP United Kingdom Department of Radiology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai China Department of Electronic Science Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance National Institute for Data Science in Health and Medicine Institute of Artificial Intelligence Xiamen University Xiamen361102 China Department of Computing Department of Brain Sciences Imperial College London LondonSW7 2AZ United Kingdom Human Phenome Institute Fudan University 825 Zhangheng Road Pudong New District Shanghai201203 China Department of Radiology Zhongshan Hospital Fudan University Shanghai China Department of Cardiovascular Medicine Ruijin Hospital Lu Wan Branch Shanghai Jiao Tong University School of Medicine Shanghai China Institute of Science and Technology for Brain-Inspired Intelligence Fudan University Shanghai200433 China Department of Computer Science Rutgers University PiscatawayNJ08854 United States AI for Oncology Netherlands Cancer Institute Plesmanlaan 121 Amsterdam1066 CX Netherlands Department of Imaging and Interventional Radiology The Chinese University of Hong Kong Hong Kong TJK-BIIT Lab School of Electrical and Information Engineering Tianjin University Tianjin300072 China Skolkovo Institute Of Science And Technology Center for Artificial Intelligence Technology 30/1 Bolshoy blvd. Moscow121205 Russia Department of Biomedical Engineering University of Virginia

Cardiac magnetic resonance imaging (MRI) provides detailed and quantitative evaluation of the heart’s structure, function, and tissue characteristics with high-resolution spatial-temporal imaging. However, its slow imaging speed and motion artifacts are notable limitations. Undersampling reconstruction, especially data-driven algorithms, has emerged as a promising solution to accelerate scans and enhance imaging performance using highly under-sampled data. Nevertheless, the scarcity of publicly available cardiac k-space datasets and evaluation platform hinder the development of data-driven reconstruction algorithms. To address this issue, we organized the Cardiac MRI Reconstruction Challenge (CMRxRecon) in 2023, in collaboration with the 26th International Conference on Medical Image Computing and computer-Assisted Intervention (MICCAI). CMRxRecon presented an extensive k-space dataset comprising cine and mapping raw data, accompanied by detailed annotations of cardiac anatomical structures. With overwhelming participation, the challenge attracted more than 285 teams and over 600 participants. Among them, 22 teams successfully submitted docker containers for the testing phase, with 7 teams submitted for both cine and mapping tasks. All teams use deep learning based approaches, indicating that deep learning has predominately become a promising solution for the problem. The first-place winner of both tasks utilizes the E2E-VarNet architecture as backbones. In contrast, U-Net is still the most popular backbone for both multi-coil and single-coil reconstructions. This paper provides a comprehensive overview of the challenge design, presents a summary of the submitted results, reviews the employed methods, and offers an in-depth discussion that aims to inspire future advancements in cardiac MRI reconstruction models. The summary emphasizes the effective strategies observed in Cardiac MRI reconstruction, including backbone architecture, loss function, pre-processing techn

关键词： Mapping

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A Survey on IntelligentTraffic Control System Using Image Processing

A Survey on IntelligentTraffic Control System Using Image Pr...

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International Conference on Signal Processing and Communication (ICSPC)

作者： dakshayani Ijeri Amar Gulaganji Abhishek A. Mandewali Pavitra C. Bannad Jyoti A. Aiholli B.L.D.E.A'S V.P Dr P.G Halakatti College of Engineering and Technology Vijayapura Karnataka India

The present traffic control systems depends upon the manual operation which leads to unnecessary wastage of fuel and time, which again leads to increase in the traffic congestion. More time is wasted at the signals even if there are no vehicles on the lane because the signals have fixed timing for all roads which is not dependent of traffic queue. Some nonuniform illuminations that come from artificial light sources affect the night-time surveillance. Artificial light sources result in glow that the objects or the vehicles present near the light sources will not be visible. Web camera is fixed and the images of all the four lanes will be captured. The method used in this paper removes the effect of glow through image gradient decomposition. The enhanced image is obtained through Poisson solver. The real time vehicle density is measured to control the traffic system using canny edge detection algorithm and the vehicle count is calculated for each path or road and comparison is made with the other roads. The green signal and red signal are received by the roads with the maximum vehicles and minimum vehicles respectively.

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All-Optical Signal Processing of Vortex Beams with diffractive deep Neural Networks

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Physical Review Applied 2021年第1期15卷 014037-014037页

作者： Zebin Huang Peipei Wang Junmin liu Wenjie Xiong Yanliang He Jiangnan Xiao Huapeng Ye Ying li Shuqing Chen dianyuan Fan International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 China Terahertz Technology Innovation Research Institute Shanghai Key Lab of Modern Optical System Terahertz Science Cooperative Innovation Center School of Optical-Electrical Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China

Vortex beams (VBs), possessing a helical phase front and carrying orbital angular momentum (OAM), have attracted considerable attention in optical communications for their mode orthogonality. A platform for achieving all-optical signal processing of VBs, however, remains elusive due to the limited light-field-manipulation capability. We introduce diffractive deep neural networks (d2NNs) and their applications to process VBs. Exploiting the multiple-light-field-modulation ability of multilayer diffraction structures and the strong data-processing capability of deep neural networks, we reveal that d2NNs can manipulate multiple VBs by configuring the phase and amplitude distribution of diffractive screens. The diffraction efficiency and converted-mode purity are greater than 96%. After being trained, d2NNs with functions of hybrid-OAM-mode generation, identification, and conversion are obtained, and three typical types of all-optical signal-processing communication, (OAM-shift keying (OAM-SK), OAM multiplexing and demultiplexing, and OAM-mode switching) are successfully achieved. Our simulation results provide an approach that breaks the limitations of poor functionality and complex design in processing VBs, introducing the d2NN as a universal light-field-modulation platform.

关键词： Interference & diffraction of light Optical quantum information processing Optical vortices Quantum communication Artificial neural networks Multilayer thin films Machine learning Optical tweezers

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On a gap in the proof of the generalised quantum Stein's lemma and its consequences for the reversibility of quantum resources

arXiv

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arXiv 2022年

作者： Berta, Mario Brandão, Fernando G.S.l. Gour, Gilad lami, ludovico Plenio, Martin B. Regula, Bartosz Tomamichel, Marco Institute for Quantum Information RWTH Aachen University Aachen Germany Department of Computing Imperial College London London United Kingdom Institute for Quantum Information and Matter California Institute of Technology PasadenaCA United States AWS Center for Quantum Computing PasadenaCA United States Department of Mathematics and Statistics Institute for Quantum Science and Technology University of Calgary ABT2N 1N4 Canada Institut für Theoretische Physik und IQST Universität Ulm Albert-Einstein-Allee 11 UlmD-89069 Germany QuSoft Science Park 123 Amsterdam1098 XG Netherlands Korteweg–de Vries Institute for Mathematics University of Amsterdam Science Park 105-107 Amsterdam1098 XG Netherlands Institute for Theoretical Physics University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Saitama Wako351-0198 Japan Department of Physics Graduate School of Science The University of Tokyo Bunkyo-ku Tokyo113-0033 Japan Center for Quantum Technologies National University of Singapore Singapore Department of Electrical and Computer Engineering College of Design and Engineering National University of Singapore Singapore

We show that the proof of the generalised quantum Stein’s lemma [Brandão & Plenio, Commun. Math. Phys. 295, 791 (2010)] is not correct due to a gap in the argument leading to lemma III.9. Hence, the main achievability result of Brandão & Plenio is not known to hold. This puts into question a number of established results in the literature, in particular the reversibility of quantum entanglement [Brandão & Plenio, Commun. Math. Phys. 295, 829 (2010);Nat. Phys. 4, 873 (2008)] and of general quantum resources [Brandão & Gour, Phys. Rev. lett. 115, 070503 (2015)] under asymptotically resource non-generating operations. We discuss potential ways to recover variants of the newly unsettled results using other approaches. © 2022, CC BY.

关键词： Quantum entanglement

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