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arXiv 2023年

作者： Mitryakhin, Victor N. Steinhoff, Alexander Drawer, Jens-Christian Shan, Hangyong Florian, Matthias Lackner, Lukas Han, Bo Eilenberger, Falk Tongay, Sefaattin Watanabe, Kenji Taniguchi, Takashi Antón-Solanas, Carlos Predojević, Ana Gies, Christopher Esmann, Martin Schneider, Christian Institute of Physics Carl von Ossietzky University of Oldenburg Oldenburg26129 Germany Institute for Theoretical Physics Bremen Center for Computational Material Science University of Bremen Bremen28334 Germany University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI48109 United States Friedrich Schiller University Jena Jena Germany Materials Science and Engineering School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Depto. de Física de Materiales Instituto Nicolás Cabrera Instituto de Física de la Materia Condensada Universidad Autónoma de Madrid Madrid28049 Spain Department of Physics Stockholm University Stockholm10691 Sweden

Emitter dephasing is one of the key issues in the performance of solid-state single photon sources. Among the various sources of dephasing, acoustic phonons play a central role in adding decoherence to the single photon emission. Here, we demonstrate, that it is possible to tune and engineer the coherence of photons emitted from a single WSe2 monolayer quantum dot via selectively coupling it to a spectral cavity resonance. We utilize an open cavity to demonstrate spectral enhancement, leveling, and suppression of the highly asymmetric phonon sideband, finding excellent agreement with a microscopic description of the exciton-phonon dephasing in a truly two-dimensional system. Moreover, the impact of cavity tuning on the dephasing is directly assessed via optical interferometry, which points out the capability to utilize light-matter coupling to steer and design dephasing and coherence of quantum emitters in atomically thin crystals. Copyright © 2023, The Authors. All rights reserved.

关键词： Selenium compounds

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Breast Lesion Segmentation in Ultrasound Images by CDeep3M

Breast Lesion Segmentation in Ultrasound Images by CDeep3M

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International Conference on computer engineering and Applications (ICCEA)

作者： Shida Wang Jin Huang Nano-Optical Material and Storage Device Research School of electronic and electrical engineering Wuhan China School of Mathematics and Computer Science Wuhan Textile University Wuhan China

ISBN: (数字)9781728159041

ISBN: (纸本)9781728159058

The proper segmentation of breast lesion based on mammography is crucial not only for traditional computer aided diagnosis but also for supervised learning by deep learning, which is significant for further quantitative analysis. To achieve a comprehensive diagnosis with versatile deep learning algorithms, a novel Docker based framework is proposed and designed by incorporating popular CNN based models CDeep3M. The validation is preceded under a unique amount of B-type ultrasound images. The results indicate that CDeep3M have a good capability for breast tumor prediction. Besides, the analysis shows that Docker framework is flexible and extensive for environmental construction for breast cancer real-time prediction, as well as other related applications.

关键词： Image segmentation Training Ultrasonic imaging Machine learning Breast cancer

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Ultrastrong Spin-Photon Coupling in Gadolinium Gallium Garnet

Ultrastrong Spin-Photon Coupling in Gadolinium Gallium Garne...

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Conference on Lasers and Electro-Optics (CLEO)

作者： T. Elijah Kritzell Junzhe Bao Jacques Doumani Jae Joon Lee Hongjing Xu Fuyang Tay Hiroyuki Nojiri Motoaki Bamba Andrey Baydin Junichiro Kono Department of Electrical and Computer Engineering Rice University Houston Texas USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas USA Department of Physics and Astronomy Rice University Houston Texas USA Institute for Materials Research Tohoku University Senai Japan The Hakubi Center for Advanced Research Kyoto University Kyoto Japan Department of Physics I Kyoto University Kyoto Japan Smalley-Curl Institute Rice University Houston Texas USA Department of Material Science and NanoEngineering Rice University Houston Texas USA

We examine ultrastrong coupling of an ensemble of paramagnetic spins in Gd 3 Ga 5 O 12 with terahertz photons in the presence of a high external magnetic field both in the bulk and thin-film limits.

ISBN: (纸本)9781957171258

We examine ultrastrong coupling of an ensemble of paramagnetic spins in Gd 3 Ga 5 O 12 with terahertz photons in the presence of a high external magnetic field both in the bulk and thin-film limits.

关键词： CCD cameras Condensed matter Magnetic fields Photons Quantum optics Terahertz spectroscopy

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Additive engineering: A Route Towards Flexible and Robust Perovskite Solar Cells

Additive Engineering: A Route Towards Flexible and Robust Pe...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： A. Giuri F. Bisconti Nicholas Rolston Reinhold H. Dauskardt R. Suhonen T. M. Kraft M. Ylikunnari V. Holappa R. Po P. Biagini C. Esposito Corcione A. Listorti S. Colella A. Rizzo CNR NANOTEC - Istituto di Nanotecnologia Lecce Italy Dipartimento di Ingegneria dell'Innovazione Università del Salento Lecce Italy Dipartimento di Matematica e Fisica “E. De Giorgi” Università del Salento Lecce Italy Department of School of Electrical Computer and Energy Engineering Arizona State University Tempe AZ USA Department of Materials Science and Engineering Stanford University Stanford CA USA Sensing Solutions VTT Technical Research Centre of Finland Ltd. Oulu Finland Renewable New Energies and Material Science Research Centere Novara Italy Dipartimento di Chimica Università di Bari Bari Italy CNR NANOTEC - c/o Dipartimento di Chimica Università di Bari Bari Italy

The record performance reached by metal halide perovskite in solar cells in a very short time calls for a real word application, however, several major intrinsic limitations need to be solved before the technological maturation can be reached. The intrinsic instability, the poor control of perovskite materials' properties deposited via wet processing, and the intrinsic mechanical fragility of the polycrystalline films are the among the most relevant issue. Herein, the use of polymeric additive has been investigated as a mean to gaining a control over the processing and improving the perovskite material stability to the environmental factors, eventually to developing perovskite inks compatible with large area solar cells manufacturing. Several polymers were evaluated based on their solubility and compatibility with perovskite precursors solutions. Among all, starch polysaccharide has been selected since it can induce a convenient viscosity modulation that make perovskite precursors' inks with different printing techniques. Importantly, starch can also enhance perovskite materials mechanical strength and tolerance to thermal stress.

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Spectral measurement of the breakdown limit of β-Ga2O3and tunnel ionization of self-trapped excitons and holes

arXiv

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arXiv 2020年

作者： Adnan, Md Mohsinur Rahman Verma, Darpan Xia, Zhanbo Kalarickal, Nidhin Kumar Rajan, Siddharth Myers, Roberto C. Department of Electrical and Computer Engineering The Ohio State University ColumbusOH43210 United States Department of Material Science and Engineering The Ohio State University ColumbusOH43210 United States

Owing to its strong ionic character coupled with a light electron effective mass, β-Ga2O3is an unusual semiconductor where large electric fields (∼1-6 MV/cm) can be applied while still maintaining a dominant excitonic absorption peak below its ultra-wide bandgap (Eg∼ 4.6-4.99 eV). This provides a rare opportunity in the solid-state to examine exciton and carrier self-trapping dynamics in the strong-field limit at steady-state. Under sub-bandgap photon excitation, we observe a field-induced red-shift of the spectral photocurrent peak associated with exciton absorption and threshold-like increase in peak amplitude at high-field associated with self-trapped hole ionization. The fielddependent spectral response is quantitatively fit with an eXciton-modified Franz-Keldysh (XFK) effect model, which includes the electric-field dependent exciton binding energy due to the quadratic Stark effect. A saturation of the spectral red-shift with reverse bias is observed exactly at the onset of dielectric breakdown providing a spectral means to detect and quantify the local electric field and dielectric breakdown behavior in β-Ga2O3. Additionally, the field-dependent responsivity provides insight to the photocurrent production pathway revealing the photocurrent contributions of selftrapped excitons (STXs) and self-trapped holes (STHs) in β-Ga2O3. Photocurrent and p-type transport in β-Ga2O3are quantitatively explained by field-dependent tunnel ionization of excitons and self-trapped holes. We employ a quantum mechanical model of the field-dependent tunnel ionization of STX and STH in β-Ga2O3to model the non-linear field-dependence of the photocurrent amplitude. Fitting to the data, we estimate an effective mass of valence band holes (18.8 m0) and an ultrafast self-trapping time of holes (0.045 fs). This indicates that minority-hole transport in β-Ga2O3can only arise through tunnel ionization of STH under strong fields. Copyright © 2020, The Authors. All rights reserved.

关键词： Gallium compounds

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Optical data transmissionwith high spectral efficiency at44Terabits/s with a soliton crystal micro-comb

Optical data transmissionwith high spectral efficiency at44T...

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Signal Processing in Photonic Communications, SPPCom 2021 - Part of OSA Advanced Photonics Congress 2021

作者： Tan, M. Corcoran, B. Xu, X. Wu, J. Boes, A. Nguyen, T. Chu, S. Little, B. Morandotti, R. Mitchell, A. Moss, D.J. Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia Dept. of Electrical and Computer Systems Engineering Monash University ClaytonVIC3800 Australia School of Engineering Rmit University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of Cas Xi'an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology Chengdu China

We report data transmission over 75km in the lab and a field trial, at 44.2 Tb/s over standard optical fibre using a single integrated chip source, reaching a spectral efficiency of 10.4 bits/s/Hz. © 2021 OSA - T...

ISBN: (纸本)9781557528209

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Electro-thermal analysis and edge termination techniques of high current β-ga2 o3 schottky rectifiers 24

Electro-thermal analysis and edge termination techniques of ...

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24th International Conference on Simulation of Semiconductor Processes and Devices, SISPAD 2019

作者： Shanna, Ribhu Patlick, Elin Yang, Jiancheng Ren, Fan Law, Mark Pearton, Stephen Material Science and Engineering University of Florida GainesvilleFL United States Electrical and Computer Engineering University of Florida GainesvilleFL United States Chemical Engineering University of Florida Gainesville FL United States

ISBN: (纸本)9781728109404

The performance and limitations of β-Ga2 O3 Schottky rectifiers is studied via simulation using the Florida Object Oriented Device and Process (FLOODS) TCAD simulator. The effect of forward bias and power is examined for various bulk and epitaxial layer thicknesses as well as for heat sink geometries. Thicker bulksubstrate results in higher maximum temperature values whereas a thinner epitaxial-layer results in higher forward currents and hence a higher maximum temperature values via Joule heating. A Cu finned heat sink geometry results in a 26.76% reduction in the maximum temperature. Edge termination techniques are examined for β-Ga2 O3 Schottky rectifiers in order to maximize the breakdown voltage, identify the location of breakdown and mitigate the maximum electric field. Best results have been observed for A1203 as the dielectric material in a field-plate structure while the effect of field-plate dimensions is also studied. © 2019 IEEE.

关键词： Heat sinks

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A new one-point residual-feedback oracle for black-box learning and control

arXiv

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arXiv 2020年

作者： Zhang, Yan Zhou, Yi Ji, Kaiyi Zavlanos, Michael M. Mechanical Enginerring and Material Science Duke University DurhamNC27708 United States Electrical and Computer Engineering The University of Utah Salt Lake CityUT84112 United States Electrical and Computer Engineering The Ohio State University ColumbusOH43210 United States

Zeroth-order optimization (ZO) algorithms have been recently used to solve black-box or simulation-based learning and control problems, where the gradient of the objective function cannot be easily computed but can be approximated using the objective function values. Many existing ZO algorithms adopt two-point feedback schemes due to their fast convergence rate compared to one-point feedback schemes. However, two-point schemes require two evaluations of the objective function at each iteration, which can be impractical in applications where the data are not all available a priori, e.g., in online optimization. In this paper, we propose a novel one-point feedback scheme that queries the function value once at each iteration and estimates the gradient using the residual between two consecutive points. When optimizing a deterministic Lipschitz function, we show that the query complexity of ZO with the proposed one-point residual feedback matches that of ZO with the existing two-point schemes. Moreover, the query complexity of the proposed algorithm can be improved when the objective function has Lipschitz gradient. Then, for stochastic bandit optimization problems where only noisy objective function values are given, we show that ZO with one-point residual feedback achieves the same convergence rate as that of two-point scheme with uncontrollable data samples. We demonstrate the effectiveness of the proposed one-point residual feedback via extensive numerical experiments. Copyright © 2020, The Authors. All rights reserved.

关键词： Feedback

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Photoluminescence Response and Magnetic Character of Iron Doped Ceria Thin Films

SSRN

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SSRN 2022年

作者： Ahmad, Farhan Shah, Abdul Hakim Khan, Junaid Rehman, Fida Rahman, Atta Ur Kashif, Muhammad Khan, Noor Saeed Arbab, Safeer Ahmad Maqbool, Esha Rehan, Imran Norouzzadeh, Pourya Shafi, Muhammad Xu, Duo Rahman, Siddiq Ur Ahmad, Mehran School of Material Science and Engineering Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China Department of Physics Khushal Khan Khattak University Karak Pakhtunkhwa Khyber Pakistan Department of Physics Islamia College Peshawar Khyber Pakhtunkhwa Pakistan School of Physics and Electronics Shandong Normal University China Lixia District Jinan250358 China Centre of Excellence in Solid State Physics University of the Punjab Quaid-i-Azam Campus Punjab Lahore Lahore Pakistan Department of Electrical Engineering University of Engineering and Technology Peshawar Pakistan Department of Computer Science and Bioinformatics Khushal Khan Khattak University Karak Khyber Pakhtunkhwa Pakistan Department of Physics Faculty of Sciences Urmia University Urmia Iran

Doped Ceria (CeO2) Due to their usage in optoelectronic devices, thin films have caught the interest of the scientific community. Iron (Fe) doped Ceria thin films are made using an application-focused sol-gel technique. Dopant concentration of Fe is varied as 0.0, 0.02, 0.04, 0.06 and 0.08. Analysis using X-ray diffraction (XRD) technology shows that the cubic phase of CeO2 is growing. at all dopant concentrations. As the quantity of dopants rises, the quantity of crystallites is seen to rise that is because of increase in the crystallinity of thin films. Mixed para-ferro behavior is observed at undoped condition. While ferromagnetic behavior is observed at all dopant concentrations. Photoluminescence (PL) spectrum has been used to study the shallow electronic defect levels. Dielectric constant and tangent loss shows normal behavior. A singular semi - circle on a Cole-Cole plot indicates a grain boundary with significant resistance. Fe doped ceria thin films can be a promising candidate for optoelectronic and magnetic devices. © 2022, The Authors. All rights reserved.

关键词： Cerium oxide

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Cryogenic in-memory computing using tunable chiral edge states

arXiv

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arXiv 2022年

作者： Liu, Yuting Lee, Albert Qian, Kun Zhang, Peng He, Haoran Ren, Zheyu Cheung, Shun Kong Li, Yaoyin Zhang, Xu Ma, Zichao Xiao, Zhihua Yu, Guoqiang Wang, Xin Liu, Junwei Wang, Zhongrui Wang, Kang L. Shao, Qiming Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong School of Material Science and Engineering Harbin Institute of Technology Shenzhen518055 China Device Research Laboratory Department of Electrical and Computer Engineering University of California Los AngelesCA90095 United States IAS Center for Quantum Technologies The Hong Kong University of Science and Technology Hong Kong Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road 999077 Hong Kong Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong Beijing National Laboratory for Condensed Matter Physics Institute of Physics University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100190 China Department of Physics The City University of Hong Kong 999077 Hong Kong Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology The Hong Kong University of Science and Technology Hong Kong ACCESS AI Chip Center for Emerging Smart Systems InnoHK Centers Hong Kong Science Park Hong Kong

Cryogenic electronics have become essential in reducing the number of input/output ports to the quantum chips and generating multiplexed reading and control pulses for scalable quantum computation 1-5. A demanding request for cryogenic electronics is to support efficient machine learning algorithms, which have been proven effective for essential quantum computation tasks such as quantum error correction and quantum control 6,7. However, current digital cryogenic electronics suffer from the von Neumann bottleneck, where the physical separation of computation and memory units causes a huge amount of energy and delay when processing data-intensive programs. Energy-efficient hardware implementation of machine learning algorithms for quantum computation requires nonvolatile and electrically-programmable devices, memristors, working at cryogenic temperatures that enable in-memory computing 8,9. Magnetic topological insulators are promising candidates due to their tunable magnetic order by electrical currents with high energy efficiency 10-15. Here, we utilize magnetic topological insulators as memristors (termed magnetic topological memristors) and introduce a chiral edge state-based cryogenic in-memory computing scheme. On the one hand, the chiral edge state can be tuned from left-handed to right-handed chirality through spin-momentum locked topological surface current injection. On the other hand, the chiral edge state exhibits giant and bipolar anomalous Hall resistance, which facilitates the electrical readout. The memristive switching and reading of the chiral edge state exhibit high energy efficiency, high stability, and low stochasticity. We achieve high accuracy in a proof-of-concept classification task using four magnetic topological memristors. Furthermore, our algorithm-level and circuit-level simulations of large-scale neural networks based on magnetic topological memristors demonstrate a software-level accuracy and lower energy consumption for image recogniti

关键词： Topology

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