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Factors limiting quantitative phase retrieval in atomic-resolution differential phase contrast scanning transmission electron microscopy using a segmented detector

arXiv

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arXiv 2021年

作者： Mawson, T. Taplin, D.J. Brown, H.G. Clark, L. Ishikawa, R. Seki, T. Ikuhara, Y. Shibata, N. Paganin, D.M. Morgan, M.J. Weyland, M. Petersen, T.C. Findlay, S.D. School of Physics and Astronomy Monash University ClaytonVIC3800 Australia Ian Holmes Imaging Center Bio21 Molecular Science and Biotechnology Institute University of Melbourne VIC3010 Australia School of Chemical and Process Engineering University of Leeds LeedsLS2 9JT United Kingdom Institute of Engineering Innovation University of Tokyo Tokyo113-8656 Japan Presto Japan Science and Technology Agency Kawaguchi Saitama3320012 Japan Monash Centre for Electron Microscopy Monash University ClaytonVIC3800 Australia Department of Materials Science and Engineering Monash University ClaytonVIC3800 Australia

Quantitative differential phase contrast imaging of materials in atomic-resolution scanning transmission electron microscopy using segmented detectors is limited by various factors, including coherent and incoherent aberrations, detector positioning and uniformity, and scan-distortion. By comparing experimental case studies of monolayer and few-layer graphene with image simulations, we explore which parameters require the most precise characterisation for reliable and quantitative interpretation of the reconstructed phases. Coherent and incoherent lens aberrations are found to have the most significant impact. For images over a large field of view, the impact of noise and non-periodic boundary conditions are appreciable, but in this case study have less of an impact than artefacts introduced by beam deflections coupling to beam scanning (imperfect tilt-shift purity). © 2021, CC BY-NC-ND.

关键词： High resolution transmission electron microscopy

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The mesoscale order of nacreous pearls

arXiv

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arXiv 2021年

作者： Gim, Jiseok Koch, Alden Otter, Laura M. Savitzky, Benjamin H. Erland, Sveinung Estroff, Lara A. Jacob, Dorrit E. Hovden, Robert Department of Materials Science & Engineering University of Michigan Ann ArborMI48109 United States Department of Biomedical Engineering University of Michigan Ann ArborMI48109 United States Research School of Earth Sciences Australian National University CanberraACT2600 Australia National Center for Electron Microscopy Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Maritime Studies Western Norway University of Applied Sciences Haugesund5528 Norway Department of Materials Science and Engineering Cornell University IthacaNY14853 United States Kavli Institute at Cornell for Nanoscale Science Cornell University IthacaNY14853 United States Applied Physics Program University of Michigan Ann ArborMI48109 United States

A pearl's distinguished beauty and toughness are attributable to the periodic stacking of aragonite tablets known as nacre. Nacre has naturally occurring mesoscale periodicity that remarkably arises in the absence of discrete translational symmetry. Gleaning the inspiring biomineral design of a pearl requires quantifying its structural coherence and understanding the stochastic processes that influence formation. By characterizing the entire structure of pearls (∼3 mm) in a cross-section at high resolution, we show that nacre has medium-range mesoscale periodicity. Self-correcting growth mechanisms actively remedy disorder and topological defects of the tablets and act as a countervailing process to longrange disorder. Nacre has a correlation length of roughly 16 tablets (∼5.5 μm) despite persistent fluctuations and topological defects. For longer distances (>25 tablets, ∼8.5 μm), the frequency spectrum of nacre tablets follows f-1.5behavior, suggesting that growth is coupled to external stochastic processes-a universality found across disparate natural phenomena, which now includes pearls. © 2021, CC BY.

关键词： Gems

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Terahertz Inverse Spin Hall Effect in Spintronic Nanostructures

SSRN

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SSRN 2023年

作者： Cheng, Jing Komissarov, Ivan Chen, Genyu Adam, Roman Chaktraborty, Debamitra Bürgler, Daniel E. Heidtfeld, Sarah Cao, Derang Büscher, Markus Hardtdegen, Hilde Mikulics, Martin Schneider, Claus Michael Gladczuk, Leszek Przyslupski, Piotr Sobolewski, Roman Materials Science Program University of Rochester RochesterNY14627-1299 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623 United States Department of Electrical and Computer Engineering University of Rochester RochesterNY14627-0231 United States Research Centre Jülich Peter Grünberg Institute Jülich52425 Germany Faculty of Physics University Duisburg-Essen Duisburg47048 Germany College of Physics Center for Marine Observation and Communications National Demonstration Center for Experimental Applied Physics Education Qingdao University Qingdao266071 China Research Centre Jülich Ernst Ruska Centre for Microscopy and Spectroscopy With Electrons Jülich52425 Germany Department of Physics University of California Davis DavisCA95616-5270 United States Institute of Physics Polish Academy of Sciences WarszawaPL-02668 Poland Department of Physics and Astronomy University of Rochester RochesterNY14627-0171 United States

Bilayers of ferromagnetic and heavy metal nanolayers excited with femtosecond laser pulses emit subpicosecond bursts of electromagnetic radiation with spectral frequencies up to several THz. We fabricated such spintronic THz emitters containing various ferromagnetic materials with vastly different magnetic remanence, saturation magnetization, and coercive field. In all cases, the THz amplitude versus magnetic field dependence follows the independently measured magnetization hysteresis loops and the THz polarization direction is perpendicular to the sample’s magnetization M, both consistent with the inverse spin Hall effect as physical origin. The M(T) variation governs the temperature dependence of the THz generation. Emitters with weakly remanent ferromagnets are field-tunable, while moderately and strongly remanent ferromagnets, once magnetized, allow intense THz generation even without an external field, nevertheless exhibiting low susceptibility to magnetic perturbations, if the hysteresis loop is square. Hence, exploiting the magnetic properties of the ferromagnetic layer enables tailoring of weakly temperature-dependent spintronic THz emitters. Finally, we explored the applicability of perovskite oxide materials such as La-Sr-Mn-O (LSMO) for THz transient generation. Although we detected THz emissions from, e.g., LSMO/Au nanobilayers, the signal was attributed to the ultrafast transient demagnetization and not the inverse spin Hall effect. © 2023, The Authors. All rights reserved.

关键词： Nanostructures

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Chemical Electron Tomography at Lower Dose and Higher Resolution

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microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Hovden, Robert Schwartz, Jonathan Sung, Suk Hyun Di, Zichao Wendy Jiang, Yi Manassa, Jason Pietryga, Jacob Qian, Yiwen Cho, Min Gee Rowell, Jonathan L Zheng, Huihuo Robinson, Richard D Gu, Junsi Kirilin, Alexey Rozeveld, Steve Ercius, Peter Scott, Mary Department of Materials Science and Engineering University of Michigan Ann Arbor MI Applied Physics Program University of Michigan Ann Arbor MI Chan Zuckerberg Initiative Redwood City CA Rowland Institute at Harvard Cambridge MA. Mathematics and Computer Science Division Argonne National Laboratory Lemont IL Advanced Photon Source Facility Argonne National Laboratory Lemont IL Department of Materials Science and Engineering U.C. Berkeley Berkeley CA National Center for Electron Microscopy Molecular Foundry Berkeley CA Department of Chemistry and Chemical Biology Cornell University Ithaca NY Argonne Leadership Computing Facility Argonne National Laboratory Lemont IL Dow Chemical Co. Terneuzen Netherlands Dow Chemical Co. Midland MI

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Atomically Dispersed Iron-Copper Dual-Metal Sites Synergistically Boost Carbonylation of Methane

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Angewandte Chemie 2024年第43期136卷

作者： Dr. Qingpeng Cheng Dr. Xueli Yao Prof. Dr. Guanna Li Guanxing Li Prof. Dr. Lirong Zheng Dr. Kaijie Yang Dr. Abdul-Hamid Emwas Prof. Dr. Xingang Li Prof. Dr. Yu Han Prof. Dr. Jorge Gascon KAUST Catalysis Center (KCC) Physical Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia Biobased Chemistry and Technology Wageningen University & Research Bornse Weilanden 9 Wageningen 6708WG The Netherlands Advanced Membranes and Porous Materials Center (AMPMC) KAUST Thuwal 23955-6900 Saudi Arabia Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Imaging and Characterization Core Lab KAUST Thuwal 23955-6900 Saudi Arabia State Key Laboratory of Chemical Engineering Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Haihe Laboratory of Sustainable Chemical Transformations Tianjin Key Laboratory of Applied Catalysis Science and Engineering School of Chemical Engineering & Technology Tianjin University Tianjin 300350 P. R. China Electron Microscopy Center School of Emergent Soft Matter South China University of Technology Guangzhou 510640 P. R. China

The direct liquid-phase oxidative carbonylation of methane, utilizing abundant natural gas, offers a mild and straightforward alternative. However, most catalysts proposed for this process suffer from low acetic acid yields due to few active sites and rapid C1 oxygenate generation, impeding their industrial feasibility. Herein, we report a highly efficient 0.1Cu/Fe-HZSM-5-TF (TF denotes template-free synthesis) catalyst featuring exclusively mononuclear Fe and Cu anchored in the ZSM-5 channels. Under optimized conditions, the catalyst achieved an unprecedented acetic acid yield of 40.5 mmol g cat −1 h −1 at 50 °C, tripling the previous records of 12.0 mmol g cat −1 h −1 . Comprehensive characterization, isotope-labeled experiments and density functional theory (DFT) calculations reveal that the homogeneous mononuclear Fe sites are responsible for the activation and oxidation of methane, while the neighboring Cu sites play a key role in retarding the oxidation process, promoting C−C coupling for effective acetic acid synthesis. Furthermore, the methyl-group carbon in acetic acid originates solely from methane, while its carbonyl-group carbon is derived exclusively from CO, rather than the conversion of other C1 oxygenates. The proposed bimetallic catalyst design not only overcomes the limitations of current catalysts but also generalizes the oxidative carbonylation of other alkanes, demonstrating promising advancements in sustainable chemical synthesis.

关键词： Methane oxidation Carbonylation Zeolites C1 chemistry synergy

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Author Correction: Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells

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Nature materials 2022年第3期21卷 378页

作者： Safakath Karuthedath Julien Gorenflot Yuliar Firdaus Neha Chaturvedi Catherine S P De Castro George T Harrison Jafar I Khan Anastasia Markina Ahmed H Balawi Top Archie Dela Peña Wenlan Liu Ru-Ze Liang Anirudh Sharma Sri H K Paleti Weimin Zhang Yuanbao Lin Erkki Alarousu Sergei Lopatin Dalaver H Anjum Pierre M Beaujuge Stefaan De Wolf Iain McCulloch Thomas D Anthopoulos Derya Baran Denis Andrienko Frédéric Laquai KAUST Solar Center Physical Sciences and Engineering Division (PSE) Materials Science and Engineering Program (MSE) King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia. Max Planck Institute for Polymer Research Mainz Germany. Imaging and Characterization Core Laboratory King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia. Department of Chemistry University of Oxford Oxford UK. Max Planck Institute for Polymer Research Mainz Germany. denis.andrienko@mpip-mainz.mpg. KAUST Solar Center Physical Sciences and Engineering Division (PSE) Materials Science and Engineering Program (MSE) King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia. frederic.laquai@kaust.edu.sa.

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Hybrid detectors for high-energy radiation based on borosilicate glass scintillator doped with Gd3+ covered by photosensitive TiO2 layer

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Radiation Physics and Chemistry 2025年 237卷

作者： Mangthong, P. Kohout, M. Ponseca, C.S. Hubička, Z. Kaewkhao, J. Kothan, S. Kirdsiri, K. Srisittipokakun, N. Olejníček, J. Cadatal-Raduban, M. Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University 73000 Thailand Center of Excellence in Glass Technology and Materials Science (CEGM) Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand Department of Low Temperature Plasma Institute of Physics of the Czech Academy of Sciences Na Slovance 1999/2 182 21 Prague 8 Czech Republic Department of Mathematics and Natural Sciences Gulf University for Science and Technology Hawally Kuwait Department of Physics School of Science and Engineering Ateneo De Manila University Manila 1004 Philippines Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai 50200 Thailand Unitec Institute of Technology 139 Carrington Road Mount Albert Auckland 1025 New Zealand Institute of Laser Engineering Osaka University 2-6 Yamadaoka Suita Osaka 565-0871 Japan

Vacuum ultraviolet (VUV) radiation, ranging from 100 to 200 nm (6.2–12.4 eV), is essential for applications in photonics, plasma diagnostics, and high-energy radiation monitoring. This study presents a hybrid VUV detector composed of a Gd2O3-doped borosilicate glass scintillator coated with a 250 nm titanium dioxide (TiO2) film. Borosilicate glass was selected for its high thermal stability, chemical durability, and rare-earth compatibility. The TiO2 a band gap near 3.2 eV layer, deposited via DC magnetron sputtering, acts as a photoconductive material that directly converts the 311 nm, approximately 3.99 eV photoluminescence emission from Gd³⁺ into an electrical signal, eliminating the need for a separate photodetector. Substrate heating during deposition and post-deposition annealing significantly improved the crystallinity of the TiO2 layer, enhancing photosensitivity without degrading the luminescence of the underlying scintillator. The selected film thickness ensures good photon absorption and surface uniformity while avoiding charge carrier recombination losses. Furthermore, The system demonstrates successful detection of 172 nm VUV radiation via direct luminescence to current conversion. This hybrid device provides a compact, integrated for high-energy radiation detection, with potential applications in dosimetry and future VUV or x-ray optoelectronic systems.

关键词： DC magnetron Gd2O3 Glass Luminescence Scintillator TiO2

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Surgical mesh coatings for infection control and temperature sensing: An in-vitro investigation

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OpenNano 2021年 5卷

作者： Houshyar, Shadi Mirzadeh, Nedaossadat Pillai, Mamatha Muraleedharan Saha, Tanushree Khalid, Asma Bhattacharyya, Amitava Dekiwadia, Chaitali Zizhou, Rumbidzai Cryle, Max J. Payne, Jennifer A.E. Bhargava, Suresh Fox, Kate Tran, Phong A. College of Science Engineering and Health School of Engineering RMIT University Melbourne 3001 Australia The Center for Advanced Materials and Industrial Chemistry College of Science Engineering and Health RMIT University GPO Box 2476V Melbourne 3001 VIC Australia Tissue Engineering Laboratory PSG Institute of Advanced Studies Coimbatore 641004 India Department of Textile Engineering Dhaka University of Engineering and Technology Gazipur-1707 Gazipur Bangladesh College of Science Engineering and Health School of Applied Sciences RMIT University Melbourne 3000 Australia Functional Innovative and Smart Textiles PSG Institute of Advanced Studies Coimbatore 641004 India RMIT Microscopy and Microanalysis Facility College of Science Engineering and Health RMIT University Melbourne 3000 Australia School of Fashion and Textiles RMIT University Brunswick Victoria 3056 Australia Department of Biochemistry and Molecular Biology Infection and Immunity Program The Monash Biomedicine Discovery Institute Monash University EMBL Clayton 3800 VIC Australia Centre for Biomedical Technologies 2 George Street Queensland University of Technology (QUT) Brisbane 4000 QLD Australia Interface Science and Materials Engineering Group School of Mechanical Medical and Process Engineering QUT 2 George Street Brisbane 4000 QLD Australia

Polypropylene (PP) remains the primary material for hernia meshes due to its biocompatibility, physical strength and ease of fabrication. However, PP meshes are still subject to complications such as mesh movement and bacterial infection that ultimately lead to mesh failure. This study describes a two-step functionalization of a PP mesh through dopamine-mediated chloro(triphenylphosphine)gold(I)/nanodiamond coatings. The gold compound provided an intrinsic surface with antimicrobial activity to the coatings, whilst the overall improvement in hydrophilicity and roughness allows for efficient adsorption of antibiotics with an aim for eradicating bacteria in the surrounding tissue. The presence of a gold compound on the surface of the mesh enhanced its contrast property, which may provide a surgical application to determine the ease of monitoring the PP mesh location after implantation inside the body to detect possible tears. Photostable negatively charged nitrogen-vacancy centres within the nanodiamonds provides an exciting possibility to optically assess locally elevated temperatures often associated with infection or excessive inflammation. The biocompatibility, antibiotic loading and associated antimicrobial properties of the coated mesh were investigated to show the potential of this new coating for future applications in hernia surgical procedures. © 2021

关键词： Chloro(triphenylphosphine)gold(I) Hernia mesh Nanodiamond Polypropylene Temperature sensing

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Roadmap on Nonlocality in Photonic materials and Metamaterials

arXiv

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arXiv 2025年

作者： Monticone, Francesco Mortensen, N. Asger Fernández-Domínguez, Antonio I. Luo, Yu Tserkezis, Christos Khurgin, Jacob B. Shahbazyan, Tigran V. Chaves, André J. Peres, Nuno M.R. Wegner, Gino Busch, Kurt Hu, Huatian della Sala, Fabio Zhang, Pu Ciracì, Cristian Aizpurua, Javier Babaze, Antton Borisov, Andrei G. Chen, Xue-Wen Christensen, Thomas Yan, Wei Yang, Yi Hohenester, Ulrich Huber, Lorenz Wubs, Martijn de Liberato, Simone Gonçalves, P.A.D. de Abajo, F. Javier García Hess, Ortwin Tarasenko, Illya Cox, Joel D. Jelver, Line Dias, Eduardo J.C. Sánchez, Miguel Sánchez Margetis, Dionisios Gómez-Santos, Guillermo Stauber, Tobias Tretyakov, Sergei Simovski, Constantin Pakniyat, Samaneh Gómez-Díaz, J. Sebastián Bondarev, Igor V. Biehs, Svend-Age Boltasseva, Alexandra Shalaev, Vladimir M. Krasavin, Alexey V. Zayats, Anatoly V. Alù, Andrea Song, Jung-Hwan Brongersma, Mark L. Levy, Uriel Long, Olivia Y. Guo, Cheng Fan, Shanhui Bozhevolnyi, Sergey I. Overvig, Adam Prudêncio, Filipa R. Silveirinha, Mário G. Gangaraj, S. Ali Hassani Argyropoulos, Christos Huidobro, Paloma A. Galiffi, Emanuele Yang, Fan Pendry, John B. Miller, David A.B. School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States POLIMA Center for Polariton-driven Light–Matter Interactions University of Southern Denmark Campusvej 55 Odense MDK-5230 Denmark D-IAS—Danish Institute for Advanced Study University of Southern Denmark Campusvej 55 Odense MDK-5230 Denmark Departamento de Física Teórica de la Materia Condensada Universidad Autónoma de Madrid MadridE-28049 Spain Universidad Autónoma de Madrid MadridE-28049 Spain School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore Key Laboratory of Radar Imaging and Microwave Photonics Ministry of Education College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing211106 China Department of Electrical and Computer Engineering Johns Hopkins University BaltimoreMD21218 United States Department of Physics Jackson State University JacksonMS39217 United States Department of Physics Aeronautics Institute of Technology SP So Jos dos Campos12228-900 Brazil Departamento de Física Universidade do Minho BragaP-4710-057 Portugal Av Mestre José Veiga Braga4715-330 Portugal Max-Born-Institut Berlin12489 Germany Humboldt-Universität zu Berlin Institut für Physik AG Theoretische Optik and Photonik Berlin12489 Germany Center for Biomolecular Nanotechnologies Istituto Italiano di Tecnologia Via Barsanti 14 Arnesano73010 Italy Via Monteroni Campus Unisalento Lecce73100 Italy School of physics Huazhong University of Science and Technology Luoyu Road 1037 Wuhan430074 China Donostia International Physics Center DIPC Donostia-San Sebastián20018 Spain Ikerbasque Basque Foundation for Science Bilbao48009 Spain Department of Electricity and Electronics University of the Basque Country Leioa48940 Spain Department of Applied Physics University of the Basque Country Donostia20018 Spain Université Paris-Saclay CNRS Institut des Scienc

Photonic technologies continue to drive the quest for new optical materials with unprecedented responses. A major frontier in this field is the exploration of nonlocal (spatially dispersive) materials, going beyond the local, wavevector-independent assumption traditionally made in optical material modeling. On one end, the growing interest in plasmonic, polaritonic and quantum materials has revealed naturally occurring nonlocalities, emphasizing the need for more accurate models to predict and design their optical responses. This has major implications also for topological, nonreciprocal, and time-varying systems based on these material platforms. Beyond natural materials, artificially structured materials—metamaterials and metasurfaces–can provide even stronger and engineered nonlocal effects, emerging from long-range interactions or multipolar effects. This is a rapidly expanding area in the field of photonic metamaterials, with open frontiers yet to be explored. In the case of metasurfaces, in particular, nonlocality engineering has become a powerful tool for designing strongly wavevector-dependent responses, enabling enhanced wavefront control, spatial compression, multifunctional devices, and wave-based computing. Furthermore, nonlocality and related concepts play a critical role in defining the ultimate limits of what is possible in optics, photonics, and wave physics. This Roadmap aims to survey the most exciting developments in nonlocal photonic materials, highlight new opportunities and open challenges, and chart new pathways that will drive this emerging field forward–toward new scientific discoveries and technological advancements. Copyright © 2025, The Authors. All rights reserved.

关键词： Nanocrystals

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THz Generation Control in Fe/X Spintronic Multilayers by chemical bonding at epitaxial Fe/GaAs(001) interfaces

THz Generation Control in Fe/X Spintronic Multilayers by che...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Roman Adam Genyu Chen Daniel E. Bürgler Derang Cao Sarah Heidtfeld Debamitra Chakraborty Jing Cheng Ivan Komissarov Hilde Hardtdegen Martin Mikulics Claus M. Schneider Roman Sobolewski Research Centre Jülich Peter Grünberg Institute (PGI-6) Jülich Germany Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics University of Rochester Rochester New York USA College of Physics Center for Marine Observation and Communications Qingdao University Qingdao China Department of Electrical and Computer Engineering University of Rochester Rochester New York USA Research Centre Jülich Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons Jülich Germany Department of Physics University of California Davis Davis California USA

We report an additional degree of control of THz transients in Fe/X spintronic emitters grown on GaAs(001). We ascribe the field-independent enhancement of the THz amplitude to specific chemical bonding at the epitaxi... 详细信息

ISBN: (纸本)9781943580910

关键词： Electromagnetic radiation Free electron lasers Gallium arsenide Magnetic fields Terahertz generation Ultrafast lasers

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