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arXiv 2019年

作者： Wu, Jing Liu, Yanpeng Liu, Yi Cai, Yongqing Zhao, Yunshan Ng, Hong Kuan Watanabe, Kenji Taniguchi, Takashi Zhang, Gang Qiu, Chengwei Chi, Dongzhi Castro Neto, A.H. Thong, John T.L. Loh, Kian Ping Hippalgaonkar, Kedar Institute of Materials research and Engineering Agency for Science Technology and Research 2 Fusionopolis Way Innovis #08-03 138634 Singapore Department of Chemistry National University of Singapore 117542 Singapore Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore Centre for Advanced 2D Materials Graphene Research Centre National University of Singapore 117546 Singapore Institute of High Performance Computing Agency for Science Technology and Research 138632 Singapore Department of Physics National University of Singapore 117542 Singapore National Institute for Materials Science Tsukuba Ibaraki305-0044 Japan SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen University Shenzhen518060 China

Local magnetic impurities arising from atomic vacancies in two-dimensional (2D) nanosheets are predicted to have a profound effect on charge transport due to resonant scattering, and provide a handle for enhancing thermoelectric properties through the Kondo effect. However, the effects of these impurities are often masked by external fluctuations and turbostratic interfaces, therefore, it is highly challenging to probe the correlation between magnetic impurities and thermoelectric parameters experimentally. In this work, we demonstrate that by placing Molybdenum Disulfide (MoS2) on a hexagonal Boron Nitride (h-BN) substrate, a colossal spin splitting of the conduction sub-band up to ~50.0±5.0 meV is observed at the sulfur vacancies, suggesting that these are local magnetic states. Transport measurements reveal a large anomalous positive Seebeck coefficient in highly conducting n-type MoS2, originating from quasiparticle resonance near the Fermi level described by the Kondo effect. Furthermore, by tuning the chemical potential, a record power factor of 50mW/m ∙ K2 in low-dimensional materials was achieved. Our work shows that defect engineering of 2D materials affords a strategy for controlling Kondo impurities and tuning thermoelectric transport. Copyright © 2019, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Autonomous efficient experiment design for materials discovery with Bayesian model averaging

arXiv

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arXiv 2018年

作者： Talapatra, Anjana Boluki, S. Duong, T. Qian, X. Dougherty, E. Arróyave, R. Department of Materials Science & Engineering TAMU 77843 United States Department of Electrical and Computer Engineering TAMU 77843 United States Department of Mechanical Engineering TAMU 77843 United States

The accelerated exploration of the materials space in order to identify configurations with optimal properties is an ongoing challenge. Current paradigms are typically centered around the idea of performing this exploration through high-throughput experimentation/computation. Such approaches, however, do not account for—the always present—constraints in resources available. Recently, this problem has been addressed by framing materials discovery as an optimal experiment design. This work augments earlier efforts by putting forward a framework that efficiently explores the materials design space not only accounting for resource constraints but also incorporating the notion of model uncertainty. The resulting approach combines Bayesian Model Averaging within Bayesian Optimization in order to realize a system capable of autonomously and adaptively learning not only the most promising regions in the materials space but also the models that most efficiently guide such exploration. The framework is demonstrated by efficiently exploring the MAX ternary carbide/nitride space through Density Functional Theory (DFT) calculations. Copyright © 2018, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Autonomous efficient experiment design for materials discovery with Bayesian model averaging

arXiv

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arXiv 2018年

关键词： Uncertainty analysis

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Temperature-independent thermal radiation

arXiv

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arXiv 2019年

作者： Shahsafi, Alireza Roney, Patrick Zhou, You Zhang, Zhen Xiao, Yuzhe Wan, Chenghao Wambold, Raymond Salman, Jad Yu, Zhaoning Li, Jiarui Sadowski, Jerzy T. Comin, Riccardo Ramanathan, Shriram Kats, Mikhail A. Department of Electrical and Computer Engineering University of Wisconsin - Madison MadisonWI United States School of Engineering and Applied Sciences Harvard University CambridgeMA United States School of Materials Engineering Purdue University West LafayetteIN United States Materials Science and Engineering University of Wisconsin - Madison MadisonWI United States Department of Physics University of Wisconsin - Madison MadisonWI United States Department of Physics Massachusetts Institute of Technology CambridgeMA United States Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY United States

Thermal emission is the process by which all objects at non-zero temperatures emit light, and is well-described by the classic Planck, Kirchhoff, and Stefan-Boltzmann laws. For most solids, the thermally emitted power increases monotonically with temperature in a one-to-one relationship that enables applications such as infrared imaging and non-contact thermometry. Here, we demonstrate ultrathin thermal emitters that violate this one-to-one relationship via the use of samarium nickel oxide (SmNiO3), a strongly correlated quantum material that undergoes a fully reversible, temperature-driven solid-state phase transition. The smooth and hysteresis-free nature of this unique insulator-to-metal (IMT) phase transition allows us to engineer the temperature dependence of emissivity to precisely cancel out the intrinsic blackbody profile described by the Stefan-Boltzmann law, for both heating and cooling. Our design results in temperature-independent thermally emitted power within the long-wave atmospheric transparency window (wavelengths of 8 - 14 µm), across a broad temperature range of ~30 °C, centered around ~120 °C. The ability to decouple temperature and thermal emission opens a new gateway for controlling the visibility of objects to infrared cameras and, more broadly, new opportunities for quantum materials in controlling heat transfer. Copyright © 2019, The Authors. All rights reserved.

关键词： Temperature distribution

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Chiral Plasmons with Twisted Atomic Bilayers

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Physical Review Letters 2020年第7期125卷 077401-077401页

作者： Xiao Lin Zifei Liu Tobias Stauber Guillermo Gómez-Santos Fei Gao Hongsheng Chen Baile Zhang Tony Low Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Materials Science Factory Instituto de Ciencia de Materiales de Madrid CSIC E-28049 Madrid Spain Institute for Theoretical Physics University of Regensburg D-93040 Regensburg Germany Departamento de Física de la Materia Condensada Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC) Universidad Autónoma de Madrid E-28049 Madrid Spain International Joint Innovation Center ZJU-UIUC Institute Zhejiang University Haining 314400 China Centre for Disruptive Photonic Technologies NTU Singapore 637371 Singapore Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA

van der Waals heterostructures of atomically thin layers with rotational misalignments, such as twisted bilayer graphene, feature interesting structural moiré superlattices. Because of the quantum coupling between the twisted atomic layers, light-matter interaction is inherently chiral; as such, they provide a promising platform for chiral plasmons in the extreme nanoscale. However, while the interlayer quantum coupling can be significant, its influence on chiral plasmons still remains elusive. Here we present the general solutions from full Maxwell equations of chiral plasmons in twisted atomic bilayers, with the consideration of interlayer quantum coupling. We find twisted atomic bilayers have a direct correspondence to the chiral metasurface, which simultaneously possesses chiral and magnetic surface conductivities, besides the common electric surface conductivity. In other words, the interlayer quantum coupling in twisted van der Waals heterostructures may facilitate the construction of various (e.g., bi-anisotropic) atomically-thin metasurfaces. Moreover, the chiral surface conductivity, determined by the interlayer quantum coupling, determines the existence of chiral plasmons and leads to a unique phase relationship (i.e., ±π/2 phase difference) between their transverse-electric (TE) and transverse-magnetic (TM) wave components. Importantly, such a unique phase relationship for chiral plasmons can be exploited to construct the missing longitudinal spin of plasmons, besides the common transverse spin of plasmons.

关键词： Light-matter interaction Near-field optics Photonics Plasmonics Twist deformation Van der Waals systems

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Negative terahertz conductivity at vertical carrier injection in a black-Arsenic-Phosphorus-Graphene heterostructure integrated with a light-emitting diode

arXiv

引用

arXiv 2019年

作者： Ryzhii, Victor Ryzhii, Maxim Otsuji, Taiichi Karasik, Valery E. Leiman, Vladimir G. Mitin, Vladimir Shur, Michael S. Research Institute of Electrical Communication Tohoku University Sendai980-8577 Japan Institute of Ultra High Frequency Semiconductor Electronics of RAS Moscow117105 Russia Center for Photonics and Infrared Technology Bauman Moscow State Technical University Moscow111005 Russia Center for Photonics and Two-Dimensional Materials Moscow Institute of Physics Technology Dolgoprudny141700 Russia Department of Computer Science and Engineering University of Aizu Aizu-Wakamatsu965-8580 Japan Department of Electrical Engineering University at Buffalo SUNY BuffaloNY1460-1920 United States Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

We propose and analyze the heterostructure comprising a black-arsenic-phosphorus layer (bAs1−xPxL) and a graphene layer (GL) integrated with a light-emitting diode (LED). The integrated b-As1−xPxL-GL-LED heterostructure can serve as an active part of the terahertz (THz) laser using the interband radiative transitions in the GL. The feasibility of the proposed concept is enabled by the combination of relatively narrow energy gap in the b-As1−xPxL and the proper band alignment with the GL. The operation of the device in question is associated with the generation of the electron-hole pairs by the LED emitted near-infrared radiation in the b-As1−xPxL, cooling of the photogenerated electrons and holes in this layer, and their injection into the GL. Since the minimum b-As1−xPL energy gap (∆G 0.15 eV) is smaller than the energy of optical phonons in the GL, (~ω0 0.2 eV), the injection into the GL can lead to a relatively weak heating of the two-dimensional electron-hole plasma (2D-EHP) in the GL. At the temperatures somewhat lower than the room temperature, the injection can cool the 2D-EHP. This is beneficial for the interband population inversion in the GL, reinforcement of its negative dynamic conductivity, and the realization of the optical and plasmonic modes lasing supporting the new types of the THz radiation sources. Copyright © 2019, The Authors. All rights reserved.

关键词： Light emitting diodes

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Publisher Correction: Graphene overcoats for ultra-high storage density magnetic media

引用

Nature communications 2021年第1期12卷 3437页

作者： N Dwivedi A K Ott K Sasikumar C Dou R J Yeo B Narayanan U Sassi D De Fazio G Soavi T Dutta O Balci S Shinde J Zhang A K Katiyar P S Keatley A K Srivastava S K R S Sankaranarayanan A C Ferrari C S Bhatia CSIR-Advanced Materials and Processes Research Institute Bhopal India. Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore. Cambridge Graphene Centre University of Cambridge Cambridge UK. Department of Engineering University of Exeter Exeter UK. Center for Nanoscale Materials Argonne National Laboratory Argonne IL USA. Institute of Materials Ecole Polytechnique Fédérale de Lausanne (EPFL) Lausanne Switzerland. Empa-Swiss Federal Laboratories for Material Science and Technology Dübendorf Switzerland. Department of Physics and Astronomy University of Exeter Exeter UK. Department of Mechanical and Industrial Engineering University of Illinois Chicago IL USA. Cambridge Graphene Centre University of Cambridge Cambridge UK. acf26@eng.cam.ac.uk.

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Corrigendum to “Fire-retardant, self-extinguishing triboelectric nanogenerators” [Nano Energy 59 (2019) 336–345]

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Nano Energy 2021年 79卷

作者： Abdelsalam Ahmed Maher F. El-Kady Islam Hassan Ayman Negm Amir Masoud Pourrahimi Mit Muni Ponnambalam Ravi Selvaganapathy Richard B. Kaner Department of Mechanical Engineering McMaster University Hamilton ON L8S 4L7 Canada Department of Biomedical Engineering McMaster University Hamilton ON L8S 4L7 Canada Department of Chemistry and Biochemistry and California NanoSystems Institute University of California Los Angeles (UCLA) Los Angeles CA 90095 United States Department of Materials Science and Engineering UCLA Los Angeles CA 90095 United States Department of Electrical Engineering & Computer Engineering McMaster University Hamilton ON L8S 4K1 Canada Department of Inorganic Chemistry University of Chemistry and Technology Prague 166 28 Prague 6 Czech Republic Department of Chemistry and Chemical Engineering Chalmers University of Technology 41296 Göteborg Sweden

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Minimum and maximum conductance of a thin film layer bridged interface: The role of anharmonicity and layer thickness

arXiv

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arXiv 2019年

作者： Zhang, Jingjie Rastgarkafshgarkolaei, Rouzbeh Polanco, Carlos A. Le, Nam Q. Esfarjani, Keivan Norris, Pamela M. Ghosh, Avik W. Electrical and Computer Engineering University of Virginia CharlottesvilleVA22904 United States Mechanical and Aerospace Engineering University of Virginia CharlottesvilleVA22904 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Research and Exploratory Development Department Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States

We study the role of anharmonicity at interfaces with an added intermediate layer designed to facilitate interfacial phonon transport. Our results demonstrate that while in the harmonic limit the bridge may lower the conductance due to fewer available channels, anharmonicity can strongly enhance the thermal conductance of the bridged structure due to added inelastic channels. Moreover, we show that the effect of anharmonicity on the conductance can be tuned by varying temperature or the bridge layer thickness, as both parameters change the total rate of occurrence of phonon-phonon scattering processes. Additionally, we show that the additive rule of thermal resistances (Ohms law) is valid for bridge layer thickness quite shorter than the average bulk MFP, beyond the regime it would be expected to fail. Copyright © 2019, The Authors. All rights reserved.

关键词： Phonons

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Mineral Detection of Neutrinos and Dark Matter. A Whitepaper

arXiv

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arXiv 2023年

作者： Baum, Sebastian Stengel, Patrick Abe, Natsue Acevedo, Javier F. Araujo, Gabriela R. Asahara, Yoshihiro Avignone, Frank Balogh, Levente Baudis, Laura Boukhtouchen, Yilda Bramante, Joseph Breur, Pieter Alexander Caccianiga, Lorenzo Capozzi, Francesco Collar, Juan I. Ebadi, Reza Edwards, Thomas Eitel, Klaus Elykov, Alexey Ewing, Rodney C. Freese, Katherine Fung, Audrey Galelli, Claudio Glasmacher, Ulrich A. Gleason, Arianna Hasebe, Noriko Hirose, Shigenobu Horiuchi, Shunsaku Hoshino, Yasushi Huber, Patrick Ido, Yuki Igami, Yohei Ishikawa, Norito Itow, Yoshitaka Kamiyama, Takashi Kato, Takenori Kavanagh, Bradley J. Kawamura, Yoji Kazama, Shingo Kenney, Christopher J. Kilminster, Ben Kouketsu, Yui Kozaka, Yukiko Kurinsky, Noah A. Leybourne, Matthew Lucas, Thalles McDonough, William F. Marshall, Mason C. Mateos, Jose Maria Mathur, Anubhav Michibayashi, Katsuyoshi Mkhonto, Sharlotte Murase, Kohta Naka, Tatsuhiro Oguni, Kenji Rajendran, Surjeet Sakane, Hitoshi Sala, Paola Scholberg, Kate Semenec, Ingrida Shiraishi, Takuya Spitz, Joshua Sun, Kai Suzuki, Katsuhiko Tanin, Erwin H. Vincent, Aaron Vladimirov, Nikita Walsworth, Ronald L. Watanabe, Hiroko Stanford Institute for Theoretical Physics Department of Physics Stanford University StanfordCA94305 United States Istituto Nazionale di Fisica Nucleare Sezione di Ferrara via Giuseppe Saragat 1 FerraraI-44122 Italy Kanagawa Yokohama236-0001 Japan SLAC National Accelerator Laboratory Stanford University 2575 Sand Hill Road Menlo ParkCA94025 United States Department of Physics University of Zurich Winterthurerstrasse 190 ZurichCH-8057 Switzerland Department of Earth and Environmental Sciences Graduate School of Environmental Studies Nagoya University Furo-cho Chikusa-ku Nagoya464-8601 Japan Department of Physics and Astronomy University of South Carolina ColumbiaSC29208 United States Mechanical and Materials Engineering Queen’s University 130 Stuart Street KingstonONK7L 2V9 Canada Department of Physics Engineering Physics and Astronomy Queen’s University 64 Bader Lane KingstonONK7L 2S8 Canada Perimeter Institute for Theoretical Physics WaterlooONN2J 2W9 Canada Istituto Nazionale di Fisica Nucleare Sezione di Milano Via Celoria 16 Milan Italy Dipartimento di Scienze Fisiche e Chimiche Università degli Studi dell’Aquila L’Aquila67100 Italy Department of Physics University of Chicago ChicagoIL60637 United States Department of Physics University of Maryland College ParkMD20742 United States Quantum Technology Center University of Maryland College ParkMD20742 United States The William H. Miller III Department of Physics and Astronomy The Johns Hopkins University BaltimoreMD21218 United States Institute for Astroparticle Physics Karlsruhe Institute of Technology Karlsruhe76021 Germany Earth and Planetary Sciences Stanford University StanfordCA94305-2115 United States Texas Center for Cosmology and Astroparticle Physics Weinberg Institute for Theoretical Physics Department of Physics The University of Texas at Austin AustinTX78712 United States The Oskar Klein Centre Department of Physics Stockholm University AlbaNova

Minerals are solid state nuclear track detectors – nuclear recoils in a mineral leave latent damage to the crystal structure. Depending on the mineral and its temperature, the damage features are retained in the material from minutes (in low-melting point materials such as salts at a few hundred ◦C) to timescales much larger than the 4.5 Gyr-age of the Solar System (in refractory materials at room temperature). The damage features from the O(50) MeV fission fragments left by spontaneous fission of 238U and other heavy unstable isotopes have long been used for fission track dating of geological samples. Laboratory studies have demonstrated the readout of defects caused by nuclear recoils with energies as small as O(1) keV. This whitepaper discusses a wide range of possible applications of minerals as detectors for ER O(1) keV nuclear recoils: Using natural minerals, one could use the damage features accumulated over O(10) Myr–O(1) Gyr to measure astrophysical neutrino fluxes (from the Sun, supernovae, or cosmic rays interacting with the atmosphere) as well as search for Dark Matter. Using signals accumulated over months to few-years timescales in laboratory-manufactured minerals, one could measure reactor neutrinos or use them as Dark Matter detectors, potentially with directional sensitivity. Research groups in Europe, Asia, and America have started developing microscopy techniques to read out the O(1)–O(100) nm damage features in crystals left by O(0.1)–O(100) keV nuclear recoils. We report on the status and plans of these programs. The research program towards the realization of such detectors is highly interdisciplinary, combining geoscience, material science, applied and fundamental physics with techniques from quantum information and Artificial Intelligence. Copyright © 2023, The Authors. All rights reserved.

关键词： Minerals

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