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arXiv 2020年

作者： Deng, Tao Chen, Cheng Su, Hao He, Junyi Liang, Aiji Cui, Shengtao Yang, Haifeng Wang, Chengwei Huang, Kui Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Lu, Donghui Hashimoto, Makoto Yang, Lexian Liu, Zhi Guo, Yanfeng Xu, Gang Liu, Zhongkai Chen, Yulin Chinese Academy of Sciences ShanghaiP. R.200050 China University of Chinese Academy of Sciences BeijingP. R.100049 China School of Physical Science and Technology ShanghaiTech University ShanghaiP. R.201210 China Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai201210 China Wuhan National High Magnetic Field Center & School of Physics Huazhong University of Science and Technology WuhanP. R.430074 China Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Collaborative Innovation Center of Quantum Matter BeijingP. R.100084 China State Key Laboratory of Low Dimensional Quantum Physics Department of Physics and Collaborative Innovation Center of Quantum Matter Tsinghua University BeijingP. R.100084 China Department of Physics University of Oxford OxfordOX1 3PU United Kingdom

There has been an upsurge in the discovery of topological quantum materials, where various topological insulators and semimetals have been theoretically predicted and experimentally observed. However, only very few of them contains silicon, the most widely used element in electronic industry. Recently, ternary compound CaAl2Si2 has been predicted to be a topological Dirac semimetal, hosting Lorentz-symmetry-violating quasiparticles with a strongly tilted conical band dispersion. In this work, by using high-resolution angle-resolved photoemission spectroscopy (ARPES), we investigated the comprehensive electronic structure of CaAl2Si2. A pair of topological Dirac crossings is observed along the kz direction, in good agreement with the ab initio calculations, confirming the topological Dirac semimetal nature of the compound. Our study expands the topological material family on Si-containing compounds, which have great application potential in realizing low-cost, nontoxic electronic device with topological quantum states. Copyright © 2020, The Authors. All rights reserved.

关键词： Electronic structure

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Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

arXiv

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arXiv 2019年

作者： Smith, K.A. Nowadnick, E.A. Fan, S. Khatib, O. Lim, S.J. Gao, B. Harms, N.C. Neal, S.N. Kirkland, J.K. Martin, M.C. Won, C.J. Raschke, M.B. Cheong, S.-W. Fennie, C.J. Carr, G.L. Bechtel, H.A. Musfeldt, J.L. Department of Chemistry University of Tennessee KnoxvilleTN37996 United States Department of Physics New Jersey Institute of Technology NewarkNJ07102 United States School of Applied and Engineering Physics Cornell University IthacaNY14850 United States Department of Materials Science and Engineering University of California Merced MercedCA95343 United States Department of Physics University of Tennessee KnoxvilleTN37996 United States Department of Physics Department of Chemistry JILA University of Colorado BoulderCO80309 United States Advanced Light Source Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Rutgers Center for Emergent Materials Rutgers University PiscatawayNJ08854 United States Department of Physics and Astronomy Rutgers University PiscatawayNJ08854 United States Laboratory for Pohang Emergent Materials Pohang Accelerator Laboratory Max Planck POSTECH Center for Complex Phase Materials Pohang University of Science and Technology Pohang790-784 Korea Republic of National Synchrotron Light Source II Brookhaven National Laboratory UptonNY11973 United States

Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures. In this work, we employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90◦ ferroelectric) domain walls in the hybrid improper ferroelectric Ca3Ti2O7. By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, we reveal how structural order parameters rotate across a wall. Thus, we link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics. Copyright © 2019, The Authors. All rights reserved.

关键词： Domain walls

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A Scintillator Attenuation Spectrometer For Intense Gamma-Rays

arXiv

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arXiv 2019年

作者： Liang, Edison Zheng, Kevin Qinyuan Yao, Kelly Lo, Willie Hasson, Hannah Zhang, Aileen Burns, Matthew Wong, Wai-Hoi Zhang, Yuxuan Dashko, Andriy Quevedo, Hernan Ditmire, Todd Dyer, Gillis Rice University Physics and Astronomy Department HoustonTX77005 United States California Institute of Technology Division of Physics Mathematics and Astronomy PasadenaCA91125 United States University of Rochester Physics Department RochesterNY14627 United States M.D. Anderson Cancer Center Diagnostic Imaging Division HoustonTX77005 United States University of Texas at Austin High Energy Density Science Center AustinTX78712 United States SLAC National Accelerator Laboratory Linac Coherent Light Source Menlo ParkCA94025 United States

A new type of compact high-resolution high-sensitivity gamma-ray spectrometer for short-pulse intense gamma-rays (250 keV – 50 MeV) has been developed by combining the principles of scintillators and attenuation spectrometers. The first prototype of this scintillator attenuation spectrometer (SAS) was tested successfully in Trident laser experiments at LANL. Later versions have been used extensively in the Texas Petawatt laser experiments in Austin TX, and more recently in OMEGA-EP laser experiments at LLE, Rochester, NY. The SAS is particularly useful for high-repetition-rate laser applications. Here we give a concise description of the design principles, capabilities and sample preliminary results of the SAS. Copyright © 2019, The Authors. All rights reserved.

关键词： Gamma rays

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Low temperature emergence of an orbital-selective mott phase in FeTe1-xSex

arXiv

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arXiv 2020年

作者： Huang, Jianwei Yu, Rong Xu, Zhijun Zhu, Jian-Xin Jiang, Qianni Wang, Meng Wu, Han Chen, Tong Denlinger, Jonathan D. Mo, Sung-Kwan Hashimoto, Makoto Gu, Genda Dai, Pengcheng Chu, Jiun-Haw Lu, Donghui Si, Qimiao Birgeneau, Robert J. Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Department of Physics Renmin University of China Beijing100872 China NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Physics University of California Berkeley BerkeleyCA94720 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of Washington SeattleWA98195 United States School of Physics Sun Yat-sen University GuangzhouGuangdong510275 China Advanced Light Source Lawrence Berkeley National Lab BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory UptonNY United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California Berkeley United States

Electronic correlation is of fundamental importance to high temperature superconductivity. Iron-based superconductors are believed to possess moderate correlation strength, which combined with their multi-orbital nature makes them a fascinating platform for the emergence of exotic phenomena. A particularly striking form is the emergence of an orbital selective Mott phase, where the localization of a subset of orbitals leads to a drastically reconstructed Fermi surface. Here, we report spectroscopic evidence of the reorganization of the Fermi surface from FeSe to FeTe as Se is substituted by Te. We uncover a particularly transparent way to visualize the localization of the dxy electron orbital through the suppression of its hybridization with the more coherent d electron orbitals, which leads to a redistribution of the orbital-dependent spectral weight near the Fermi level. These noteworthy features of the Fermi surface are accompanied by a divergent behavior of a band renormalization in the dxy orbital. All of our observations are further supported by our theoretical calculations to be salient spectroscopic signatures of such a non-thermal evolution from a strongly correlated metallic phase towards an orbital-selective Mott phase in FeTe1−xSex as Se concentration is reduced. Copyright © 2020, The Authors. All rights reserved.

关键词： Fermi surface

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Presolar stardust in asteroid Ryugu

arXiv

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arXiv 2022年

作者： Barosch, Jens Nittler, Larry R. Wang, Jianhua O'D. Alexander, Conel M. De Gregorio, Bradley T. Engrand, Cécile Kebukawa, Yoko Nagashima, Kazuhide Stroud, Rhonda M. Yabuta, Hikaru Abe, Yoshinari Aléon, Jérôme Amari, Sachiko Amelin, Yuri Bajo, Ken-Ichi Bejach, Laure Bizzarro, Martin Bonal, Lydie Bouvier, Audrey Carlson, Richard W. Chaussidon, Marc Choi, Byeon-Gak Cody, George D. Dartois, Emmanuel Dauphas, Nicolas Davis, Andrew M. Dazzi, Alexandre Deniset-Besseau, Ariane Rocco, Tommaso Di Duprat, Jean Fujiya, Wataru Fukai, Ryota Gautam, Ikshu Haba, Makiko K. Hashiguchi, Minako Hibiya, Yuki Hidaka, Hiroshi Homma, Hisashi Hoppe, Peter Huss, Gary R. Ichida, Kiyohiro Iizuka, Tsuyoshi Ireland, Trevor R. Ishikawa, Akira Ito, Motoo Itoh, Shoichi Kamide, Kanami Kawasaki, Noriyuki Kilcoyne, David A.L. Kita, Noriko T. Kitajima, Kouki Kleine, Thorsten Komatani, Shintaro Komatsu, Mutsumi Krot, Alexander N. Liu, Ming-Chang Martins, Zita Masuda, Yuki Mathurin, Jérémie McKeegan, Kevin D. Montagnac, Gilles Morita, Mayu Mostefaoui, Smail Motomura, Kazuko Moynier, Frédéric Nakai, Izumi Nguyen, Ann N. Ohigashi, Takuji Okumura, Taiga Onose, Morihiko Pack, Andreas Park, Changkun Piani, Laurette Qin, Liping Quirico, Eric Remusat, Laurent Russell, Sara S. Sakamoto, Naoya Sandford, Scott A. Schönbächler, Maria Shigenaka, Miho Suga, Hiroki Tafla, Lauren Takahashi, Yoshio Takeichi, Yasuo Tamenori, Yusuke Tang, Haolan Terada, Kentaro Terada, Yasuko Usui, Tomohiro Verdier-Paoletti, Maximilien Wada, Sohei Wadhwa, Meenakshi Wakabayashi, Daisuke Walker, Richard J. Yamashita, Katsuyuki Yamashita, Shohei Yin, Qing-Zhu Yokoyama, Tetsuya Yoneda, Shigekazu Young, Edward D. Yui, Hiroharu Zhang, Ai-Cheng Abe, Masanao Miyazaki, Akiko Nakato, Aiko Nakazawa, Satoru Nishimura, Masahiro Okada, Tatsuaki Saiki, Takanao Tanaka, Satoshi Terui, Fuyuto Tsuda, Yuichi Watanabe, Seiichiro Yada, Toru Yogata, Kasumi Yoshikawa, Makoto Nakamura, Tomoki Naraoka, Hiroshi Noguchi, Takaaki Okazaki, Ryuji Sakamoto, Kanako Tachibana, Shogo Yurimoto, Hisayoshi Earth and Planets Laboratory Carnegie Institution of Washington 5241 Broad Branch Rd. NW WashingtonDC20015 United States Materials Science and Technology Division US Naval Research Laboratory WashingtonDC20375 United States IJCLab UMR 9012 Université Paris-Saclay CNRS Orsay91405 France Faculty of Engineering Yokohama National University Kanagawa Yokohama240-8501 Japan Hawai‘i Institute of Geophysics and Planetology University of Hawai‘i at Mānoa HonoluluHI96822 United States Department of Earth and Planetary Systems Science Hiroshima University Higashi-Hiroshima Hiroshima739-8526 Japan Graduate School of Engineering Materials Science and Engineering Tokyo Denki University Tokyo120-8551 Japan Institut de Mineralogie Physique des Materiaux et de Cosmochimie Museum National d'Histoire Naturelle CNRS Sorbonne Université Paris75231 France McDonnell Center for the Space Sciences and Physics Department Washington University St. LouisMO63130 United States Geochemical Research Center The University of Tokyo Bunkyo-ku Tokyo113-0033 Japan Guangzhou Institute of Geochemistry Chinese Academy of Sciences GD Guangzhou510640 China Department of Natural History Sciences Hokkaido University Sapporo060-0810 Japan Centre for Star and Planet Formation Globe Institute University of Copenhagen Copenhagen1350 Denmark Institut de Planétologie et d'Astrophysique Université Grenoble Alpes Grenoble38000 France Bayerisches Geoinstitut Universität Bayreuth Bayreuth95447 Germany Institut de Physique du Globe de Paris Université de Paris CNRS Paris75005 France Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of UMR 8214 Université Paris-Saclay CNRS Orsay91405 France Department of the Geophysical Sciences Enrico Fermi Institute The University of Chicago ChicagoIL60637 United States UMR 8000 Université Paris-Saclay CNRS Orsay91405 France Faculty of Geosciences and Geography University of Göttingen Götti

We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA’s Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are 4.8 !".$%&.' ppm for O-anomalous grains, 25 !(%$ ppm for SiC grains and 11 !)%(ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of 15 SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: 23 !$%' ppm SiC and 9.0 !).$%(.& ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu-CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material. Copyright © 2022, The Authors. All rights reserved.

关键词： Silicon carbide

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Ptychographic wavefront characterisation for single-particle imaging at X-ray lasers

arXiv

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arXiv 2020年

作者： Daurer, Benedikt J. Sala, Simone Hantke, Max F. Reddy, Hemanth K.N. Bielecki, Johan Shen, Zhou Nettelblad, Carl Svenda, Martin Ekeberg, Tomas Carini, Gabriella A. Hart, Philip Osipov, Timur Aquila, Andrew Loh, N. Duane Maia, Filipe R.N.C. Thibault, Pierre Centre for BioImaging Sciences National University of Singapore Singapore117557 Singapore Laboratory of Molecular Biophysics Department of Cell and Molecular Biology Uppsala University UppsalaSE-75124 Sweden Diamond Light Source Harwell Science & Innovation Campus DidcotOX11 0DE United Kingdom Department of Physics & Astronomy University College London LondonWC1E 6BT United Kingdom Department of Physics & Astronomy University of Southampton SouthamptonSO17 1BJ United Kingdom Physical and Theoretical Chemistry Laboratory Oxford University OxfordOX1 3QZO United Kingdom European XFEL GmbH Holzkoppel 4 Schenefeld22869 Germany Department of Physics National University of Singapore Singapore117557 Singapore Division of Scientific Computing Department of Information Technology Science for Life Laboratory Uppsala University UppsalaSE-75105 Sweden Department of Applied Physics Biomedical and X-Ray Physics KTH – Royal Institute of Technology StockholmSE 10691 Sweden SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Brookhaven National Laboratory UptonNY11973 United States NERSC Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Universitá degli Studi di Trieste Trieste34127 Italy

A well-characterised wavefront is important for many X-ray free-electron laser (XFEL) experiments, especially for single-particle imaging (SPI), where individual bio-molecules randomly sample a nanometer-region of highly-focused femtosecond pulses. We demonstrate high-resolution multiple-plane wavefront imaging of an ensemble of XFEL pulses, focused by Kirkpatrick-Baez (KB) mirrors, based on mixed-state ptychography, an approach letting us infer and reduce experimental sources of instability. From the recovered wavefront profiles, we show that while local photon fluence correction is crucial and possible for SPI, a small diversity of phase-tilts likely has no impact. Our detailed characterisation will aid interpretation of data from past and future SPI experiments, and provides a basis for further improvements to experimental design and reconstruction algorithms. © 2020 Optical Society of America Copyright © 2020, The Authors. All rights reserved.

关键词： Wavefronts

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Author Correction: Materializing rival ground states in the barlowite family of kagome magnets: quantum spin liquid, spin ordered, and valence bond crystal states

引用

npj Quantum Materials 2020年第1期5卷 1页

作者： Rebecca W. Smaha Wei He Jack Mingde Jiang Jiajia Wen Yi-Fan Jiang John P. Sheckelton Charles J. Titus Suyin Grass Wang Yu-Sheng Chen Simon J. Teat Adam A. Aczel Yang Zhao Guangyong Xu Jeffrey W. Lynn Hong-Chen Jiang Young S. Lee Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park USA Department of Chemistry Stanford University Stanford USA Department of Materials Science and Engineering Stanford University Stanford USA Department of Applied Physics Stanford University Stanford USA Department of Physics Stanford University Stanford USA NSF’s ChemMatCARS Center for Advanced Radiation Sources c/o Advanced Photon Source/ANL The University of Chicago Argonne USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge USA Department of Physics and Astronomy University of Tennessee Knoxville USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg USA Department of Materials Science and Engineering University of Maryland College Park USA

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Publisher Correction: Materializing rival ground states in the barlowite family of kagome magnets: quantum spin liquid, spin ordered, and valence bond crystal states

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npj Quantum Materials 2020年第1期5卷 1页

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Analysis of the synchrotron radiation from segmented undulator in double-mini beta function 8

Analysis of the synchrotron radiation from segmented undulat...

引用

8th International Particle accelerator Conference, IPAC 2017

作者： Luo, H.W. Chung, T.Y. Hwang, C.S. Lee, C.H. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9783954501823

Three long straight sections with double-mini beta-y lattice were created in the Taiwan Photon source (TPS) for which the effects of focusing elements and phase shifters between the collinear undulators result in incorrect calculations of the brilliance while assuming a Gaussian-approximation. Therefore, an on-axis Wigner distribution function (WDF), which includes effects of wave phenomena, is a natural way to measure the intensity of synchrotron radiation and is used in this article as the definition of brilliance. © 2017 CC-BY-3.0 and by the respective authors

关键词： Synchrotron radiation

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A low temperature inkjet printing and filling process for low resistive silver TSV fabrication in a SU-8 substrate

A low temperature inkjet printing and filling process for lo...

引用

IEEE International Conference on Micro Electro Mechanical Systems

作者： Tsung-Han Yang Zi-Li Guo Yu-Min Fu Yu-Ting Cheng Yen-Fang Song Pu-Wei Wu Department of Electronics Engineering National Chiao Tung University Hsinchu Taiwan Program of Science and Technology of Accelerator Light Source National Chiao Tung University and National Synchrotron Radiation Research Center Hsinchu Taiwan

ISBN: (纸本)9781509050796

The paper presents a low temperature (with 60 °C) inkjet printing and filling process to realize low resistive Ag TSV (Through Substrate Vias) with the aspect ratio of via depth vs. diameter from 2 to 5 in a SU-8 substrate potential for flexible microsystem packaging applications. Combining humidity control and layer-by-layer Ag mirror reaction, the proposed process technology can accomplish a fully filled TSV with the lowest electrical resistivity of ~450 μΩ·cm in comparison with the prior printing and filling technologies.

关键词： Through-silicon vias Filling Substrates Printing Mirrors Resistance Ink

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