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arXiv 2021年

作者： Bac, S.-K. Koller, K. Lux, F. Wang, J. Riney, L. Borisiak, K. Powers, W. Zhukovskyi, M. Orlova, T. Dobrowolska, M. Furdyna, J.K. Dilley, N.R. Rokhinson, L.P. Mokrousov, Y. McQueeney, R.J. Heinonen, O. Liu, X. Assaf, Badih A. Department of Physics University of Notre Dame Notre DameIN46556 United States Institute of Physics Johannes Gutenberg University Mainz Mainz55099 Germany Notre Dame Integrated Imaging Facility University of Notre Dame Notre DameIN46556 United States Peter Grünberg Institut Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany Ames Laboratory AmesIA50011 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Department of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

Three-dimensional (3D) compensated MnBi2Te4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi2Te4 originates from a topological response that is sensitive to the perpendicular magnetic moment and to its canting angle. Synthesis by molecular beam epitaxy allows us to obtain a large-area quasi-3D 24-layer MnBi2Te4 with near-perfect compensation that hosts the phase diagram observed in bulk which we utilize to probe the AHE. This AHE is seen to exhibit an antiferromagnetic response at low magnetic fields, and a clear evolution at intermediate fields through surface and bulk spin-flop transitions into saturation. Throughout this evolution, the AHE is super-linear versus magnetization rather than the expected linear relationship. We reveal that this discrepancy is related to the canting angle, consistent with the symmetry of the crystal. Our findings bring to light a topological anomalous Hall response that can be found in non-collinear ferromagnetic, and antiferromagnetic phases. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic moments

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First-principles studies of dopant and radiation defect effects on optical fiber sensors 11

First-principles studies of dopant and radiation defect effe...

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11th Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2019

作者： Da Silver, Thiago H. Butler, Drew Biaggne, Austin Kandadai, Nirmala Subbaraman, Harish Daw, Joshua Li, Lan Micron School of Materials Science and Engineering Boise State University 1910 University Drive BoiseID83725 United States Department of Electrical and Computer Engineering Boise State University 1910 University Drive BoiseID83725 United States High Temperature Test Laboratory Idaho National Laboratory 2525 Fremont Avenue Idaho FallsID83415 United States Center for Advanced Energy Studies 995 University Blvd Idaho FallsID83401 United States

ISBN: (纸本)9780894487835

Density functional theory-based calculations and ab-initio molecular dynamics have been performed in order to study the effects of dopants and radiation defects on the structures and optical properties of amorphous silica in comparison to sapphire - another high-temperature and radiation-resistant material. Out studies focused on oxygen deficient centers ODCs (a typical point defect due to radiation damage) and fluorine F dopants. Optical properties depend on dielectric function, calculated from the charge density of the material. With real- and imaginary-part dielectric functions, all the other optical properties, such as refractive index, energy loss function, and absorption coefficient, could be derived. Optical properties of amorphous silica and sapphire become anisotropic with either ODC or F dopants. They contribute characteristic peaks to the optical spectra and induce minor peaks in the low photon energy ranges. Static optical coefficients significantly increase with F dopants, but they might remain or slightly increase with ODC. Our results suggest that adding dopants can improve the optical properties of the materials and potentially inhabit the formation of high-temperature and radiation defects, resulting in an enhancement of the light signal in their transmitted spectra. Controlling dopant concentration also plays a crucial role, because a high dopant concentration could cause a structural distortion and degrade the optical performance of the material. © 2018 Westinghouse Electric Company LLC All Rights Reserved

关键词： Sapphire

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Reproducible brain-wide association studies require thousands of individuals (Mar, 10.1038/s41586-022-04492-9, 2022)

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NATURE 2022年第7911期605卷 E11-E11页

作者： Marek, Scott Tervo-Clemmens, Brenden Calabro, Finnegan J. Montez, David F. Kay, Benjamin P. Hatoum, Alexander S. Donohue, Meghan Rose Foran, William Miller, Ryland L. Hendrickson, Timothy J. Malone, Stephen M. Kandala, Sridhar Feczko, Eric Miranda-Dominguez, Oscar Graham, Alice M. Earl, Eric A. Perrone, Anders J. Cordova, Michaela Doyle, Olivia Moore, Lucille A. Conan, Gregory M. Uriarte, Johnny Snider, Kathy Lynch, Benjamin J. Wilgenbusch, James C. Pengo, Thomas Tam, Angela Chen, Jianzhong Newbold, Dillan J. Zheng, Annie Seider, Nicole A. Van, Andrew N. Metoki, Athanasia Chauvin, Roselyne J. Laumann, Timothy O. Greene, Deanna J. Petersen, Steven E. Garavan, Hugh Thompson, Wesley K. Nichols, Thomas E. Yeo, B. T. Thomas Barch, Deanna M. Luna, Beatriz Fair, Damien A. Dosenbach, Nico U. F. Department of Psychiatry Washington University School of Medicine St Louis MO USA Department of Neurology Washington University School of Medicine St Louis MO USA Department of Psychological and Brain Sciences Washington University in St Louis St Louis MO USA Department of Psychiatry Massachusetts General Hospital Harvard Medical School Boston MA USA Department of Psychology University of Pittsburgh Pittsburgh PA USA Department of Psychiatry University of Pittsburgh Pittsburgh PA USA Department of Bioengineering University of Pittsburgh Pittsburgh PA USA Department of Biomedical Engineering Washington University in St Louis St Louis MO USA Department of Radiology Washington University School of Medicine St Louis MO USA Department of Neurological Surgery Washington University School of Medicine St Louis MO USA Program in Occupational Therapy Washington University School of Medicine St Louis MO USA Department of Pediatrics Washington University School of Medicine St Louis MO USA University of Minnesota Informatics Institute University of Minnesota Minneapolis MN USA Department of Psychology University of Minnesota Minneapolis MN USA Masonic Institute for the Developing Brain University of Minnesota Medical School Minneapolis MN USA Department of Pediatrics University of Minnesota Medical School Minneapolis MN USA Department of Psychiatry Oregon Health and Science University Portland OR USA Minnesota Supercomputing Institute University of Minnesota Minneapolis MN USA Institute of Child Development University of Minnesota Medical School Minneapolis MN USA Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Centre for Sleep and Cognition National University of Singapore Singapore Singapore Centre for Translational MR Research National University of Singapore Singapore Singapore N.1 Institute for Health Institute for Digital Medicine National University of Singapore Singapore Sing

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Thermoelectric materials: Compositional Fluctuations Locked by Athermal Transformation Yielding High Thermoelectric Performance in GeTe (Adv. Mater. 1/2021)

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Advanced materials 2021年第1期33卷

作者： Yi-Fen Tsai Pai-Chun Wei Liuwen Chang Kuang-Kuo Wang Chun-Chuen Yang Yen-Chung Lai Cheng-Rong Hsing Ching-Ming Wei Jian He G. Jeffrey Snyder Hsin-Jay Wu Department of Materials and Optoelectronic science National Sun Yat-sen University Kaohsiung 80424 Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu 30010 Taiwan Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials National Taiwan University Taipei 10617 Taiwan Department of Physics Chung Yuan Christian University Chung-Li Jhongli 32023 Taiwan National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan Department of Physics and Astronomy Clemson Nanomaterials Institute Clemson University Clemson 29634-0978 USA Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA

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High performance of supercapacitors containing an ionic liquid electrolyte by means of electrochemical and computational studies

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Electrochimica Acta 2025年 535卷

作者： Raissa Venâncio Débora A.C. da Silva Ludmila O. Borges Isabel A. Silva Leonardo Morais Da Silva Gustavo Doubek Leonardo J.A. Siqueira Hudson Zanin Center for Innovation on New Energies Advanced Energy Storage Division BREnergies Universidade Estadual de Campinas School of Electrical and Computer Engineering Av. Albert Einstein 400 Campinas SP 13083-852 Brazil Hybrid Materials Laboratory Chemistry Department Institute of Environmental Science Chemical and Pharmaceutical Federal University of São Paulo– Str. São Nicolau 210 2nd floor Diadema SP Brazil Department of Chemistry Laboratory of Fundamental and Applied Electrochemistry Federal University of Jequitinhonha and Mucuri’s Valley Rodovia MGT 367 km 583 5000 Alto da Jacuba 39100-000 Diamantina MG Brazil Advanced Energy Storage Division Laboratory of Advanced Batteries (LAB) Center for Innovation on New Energies School of Chemical Engineering University of Campinas (Unicamp) Campinas Sao Paulo 13083-852 Brazil

This study characterizes the electrochemical behavior of symmetric coin cells with AC-based electrodes filled with the ammonium-based ionic liquid, a promising supercapacitor electrolyte due to its large voltage window and ambient temperature operation. We employed cyclic voltammetry, single-step chronoamperometry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge techniques to evaluate the electrochemical performance of the supercapacitors thoroughly. Our findings highlight the quasi-rectangular current-voltage profile up to 3.6 V, beyond which a faradaic current due to electrolyte degradation becomes significant. These results revealed a minor faradaic component, with impedance analysis showing typical behavior of well-formed electrical double layers (EDLs), influenced by the unique properties of ionic liquids. We observed that the ion dynamics and capacitance behavior align well with theoretical models, particularly the Goodwin-Kornishev mean-field theory. The study underscores the potential of ionic liquid-based supercapacitors to achieve high performance, with specific capacitance values reaching ∼2000 F g -1 and great energy and power output, comparable to lithium-ion batteries. Molecular dynamics simulations further elucidated the charging mechanisms, ion migration, and structural interactions within the EDLs. These comprehensive insights validate the suitability of butyltrimethylammonium bis(trifluoromethylsulfonyl)imide [N 1114 ][NTf 2 ] for advanced supercapacitor applications, highlighting its ability to deliver exceptional electrochemical performance under optimized conditions.

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Practical route to entanglement-enhanced communication over noisy bosonic channels

arXiv

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arXiv 2019年

作者： Shi, Haowei Zhang, Zheshen Zhuang, Quntao James C. Wyant College of Optical Sciences University of Arizona TucsonAZ85721 United States Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

Entanglement can offer substantial advantages in quantum information processing, but loss and noise hinder its applications in practical scenarios. Although it has been well known for decades that the classical communication capacity over lossy and noisy bosonic channels can be significantly enhanced by entanglement, no practical encoding and decoding schemes are available to realize any entanglement-enabled advantage. Here, we report structured encoding and decoding schemes for such an entanglement-assisted communication scenario. Specifically, we show that phase encoding on the entangled two-mode squeezed vacuum state saturates the entanglement-assisted classical communication capacity and overcomes the fundamental limit of covert communication without entanglement assistance. We then construct receivers for optimum hypothesis testing protocols under discrete phase modulation and for optimum noisy phase estimation protocols under continuous phase modulation. Our results pave the way for entanglement-assisted communication and sensing in the radiofrequency and microwave spectral ranges. Copyright © 2019, The Authors. All rights reserved.

关键词： Phase modulation

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Phase imaging with computational specificity (PICS) for measuring dry mass changes in sub-cellular compartments

arXiv

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arXiv 2020年

作者： Kandel, Mikhail E. He, Yuchen R. Lee, Young Jae Chen, Taylor Hsuan-Yu Sullivan, Kathryn Michele Aydin, Onur Saif, Taher M.A. Kong, Hyunjoon Sobh, Nahil Popescu, Gabriel Beckman Institute University of Illinois at Urbana-Champaign UrbanaIL United States Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL United States Neuroscience Program University of Illinois at Urbana-Champaign UrbanaIL United States Department of Bioengineering University of Illinois at Urbana-Champaign UrbanaIL United States Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign UrbanaIL United States Chemical and Biomolecular Engineering University of Illinois at Urbana-Champaign UrbanaIL United States Carl Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign UrbanaIL United States

Due to its specificity, fluorescence microscopy (FM) has become a quintessential imaging tool in cell biology. However, photobleaching, phototoxicity, and related artifacts continue to limit FM’s utility. Recently, it has been shown that artificial intelligence (AI) can transform one form of contrast into another. We present PICS, a combination of quantitative phase imaging and AI, which provides information about unlabeled live cells with high specificity. Our imaging system allows for automatic training, while inference is built into the acquisition software and runs in real-time. Applying the computed fluorescence maps back to the QPI data, we measured the growth of both nuclei and cytoplasm independently, over many days, without loss of viability. Using a QPI method that suppresses multiple scattering, we measured the dry mass content of individual cell nuclei within spheroids. In its current implementation, PICS offers a versatile quantitative technique for continuous simultaneous monitoring of individual cellular components in biological applications where long-term label-free imaging is desirable. Copyright © 2020, The Authors. All rights reserved.

关键词： Fluorescence microscopy

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Collective near-field coupling in infrared-phononic metasurfaces for nano-light canalization

arXiv

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arXiv 2020年

作者： Li, Peining Hu, Guangwei Dolado, Irene Tymchenko, Mykhailo Qiu, Cheng-Wei Alfaro-Mozaz, Francisco Javier Casanova, Felix Hueso, Luis E. Liu, Song Edgar, James H. Vélez, Saül Alu, Andrea Hillenbrand, Rainer Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China CIC nanoGUNE BRTA Donostia-San Sebastián20018 Spain Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore Advanced Science Research Center City University of New York New York10031 United States IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Tim Taylor Dept. of Chemical Engineering Kansas State University ManhattanKS66506 United States Department of Materials ETH Zürich Zürich8093 Switzerland CIC NanoGUNE BRTA UPV EHU Donostia-San Sebastián20018 Spain

Polaritons - coupled excitations of photons and dipolar matter excitations - can propagate along anisotropic metasurfaces with either hyperbolic or elliptical dispersion. At the transition from hyperbolic to elliptical dispersion (corresponding to a topological transition), various intriguing phenomena are found, such as an enhancement of the photonic density of states, polariton canalization and hyperlensing. Here we investigate theoretically and experimentally the topological transition and the polaritonic coupling of deeply subwavelength elements (structure sizes ∼ λ/100, λ being the free-space wavelength) in a uniaxial infrared-phononic metasurface, a grating of hexagonal boron nitride (hBN) nanoribbons. By hyperspectral infrared nanoimaging, we observe, for the first time, a synthetic transverse optical phonon resonance (that is, the strong collective near-field coupling of the nanoribbons) in the middle of the hBN Reststrahlen band, yielding a topological transition from hyperbolic to elliptical dispersion. We further visualize and characterize the spatial evolution of a deeply subwavelength canalization mode (a spatial confinement of about 300 nm, ∼ λ/22) near the transition frequency, which is a collimated polariton that is the basis for hyperlensing and diffraction-less propagation. Our results provide fundamental insights into the role of polaritonic near-field coupling in metasurfaces for creating topological transitions and polariton canalization. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

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Ferroelectric Switching: Giant Ferroelectric Resistance Switching Controlled by a Modulatory Terminal for Low-Power Neuromorphic In-Memory Computing (Adv. Mater. 21/2021)

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Advanced materials 2021年第21期33卷

作者： Fei Xue Xin He Zhenyu Wang José Ramón Durán Retamal Zheng Chai Lingling Jing Chenhui Zhang Hui Fang Yang Chai Tao Jiang Weidong Zhang Husam N. Alshareef Zhigang Ji Lain-Jong Li Jr-Hau He Xixiang Zhang Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong University Shanghai 200240 China Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia Department of Electronics and Electrical Engineering Liverpool John Moores University Liverpool L3 3AF UK Computer Science Department Loughborough University Loughborough LE11 3TU UK Department of Applied Physics The Hong Kong Polytechnic University Kowloon Hong Kong China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China Department of Materials Science and Engineering University of New South Wales Kensington NSW 2052 Australia Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China

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P-2: Hydrogenated SnO for p-channel oxide Thin Film Transistor

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SID Symposium Digest of Technical Papers 2020年第1期51卷

作者： Alex Wootae Lee Kosuke Matsuzaki Kenji Nomura Materials Science and Engineering program University of California San Diego La Jolla California 92092 USA Materials and Structures Laboratory Tokyo Institute of Technology Nagatsuta Midori-ku Yokohama 226-8503 Japan Department of Electrical and Computer Engineering University of California San Diego La Jolla California 92092 USA

Subgap defect termination for p-type Tin monoxide (SnO) is developed with thermal annealing in hydrogen ambient for p-channel oxide thin-film transistor (TFT). High-performance p-channel oxide TFT with the TFT mobility of ~1.4-1.8 cm 2 /Vs and large on-to-off current as large as 10 5 was demonstrated. Hydrogen-containing annealing also maintains SnO phase stable up to 390 °C and effectively reduces the subgap defect, which offer the improvement in TFT characteristics.

关键词： p-channel oxide thin film transistor tin monoxide hydrogen defect termination hydrogenated SnO

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