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arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 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 California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

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SARS-CoV-2 identified through crystallographic screening and computational docking

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Science Advances 2021年第16期7卷

作者： Schuller, Marion Correy, Galen J. Gahbauer, Stefan Fearon, Daren Wu, Taiasean Díaz, Roberto Efraín Young, Iris D. Martins, Luan Carvalho Smith, Dominique H. Schulze-Gahmen, Ursula Owens, Tristan W. Deshpande, Ishan Merz, Gregory E. Thwin, Aye C. Biel, Justin T. Peters, Jessica K. Moritz, Michelle Herrera, Nadia Kratochvil, Huong T. Aimon, Anthony Bennett, James M. Neto, Jose Brandao Cohen, Aina E. Dias, Alexandre Douangamath, Alice Dunnett, Louise Fedorov, Oleg Ferla, Matteo P. Fuchs, Martin R. Gorrie-Stone, Tyler J. Holton, James M. Johnson, Michael G. Krojer, Tobias Meigs, George Powell, Ailsa J. Rack, Johannes Gregor Matthias Rangel, Victor L. Russi, Silvia Skyner, Rachael E. Smith, Clyde A. Soares, Alexei S. Wierman, Jennifer L. Zhu, Kang O Brien, Peter Jura, Natalia Ashworth, Alan Irwin, John J. Thompson, Michael C. Gestwicki, Jason E. Von Delft, Frank Shoichet, Brian K. Fraser, James S. Ahel, Ivan Sir William Dunn School of Pathology University of Oxford South Parks Road OxfordOX1 3RE United Kingdom Department of Bioengineering and Therapeutic Sciences University of California San Francisco San FranciscoCA94158 United States Department of Pharmaceutical Chemistry University of California San Francisco San FranciscoCA94158 United States Diamond Light Source Ltd. Harwell Science and Innovation Campus DidcotOX11 0DE United Kingdom Institute for Neurodegenerative Disease University of California San Francisco San FranciscoCA94158 United States Chemistry and Chemical Biology Graduate Program University of California San Francisco San FranciscoCA94158 United States Tetrad Graduate Program University of California San Francisco San FranciscoCA94158 United States Coronavirus Research Group Structural Biology Consortium University of California San Francisco San FranciscoCA94158 United States Biochemistry Department Institute for Biological Sciences Federal University of Minas Gerais Belo Horizonte Brazil Helen Diller Family Comprehensive Cancer University of California San Francisco San FranciscoCA94158 United States Centre for Medicines Discovery University of Oxford South Parks Road HeadingtonOX3 7DQ United Kingdom Stanford Synchrotron Radiation Lightsource Slac National Accelerator Center Menlo ParkCA94025 United States Wellcome Centre for Human Genetics University of Oxford Old Road Campus OxfordOX3 7BN United Kingdom National Synchrotron Light Source Ii Brookhaven National Laboratory UptonNY11973 United States Department of Biochemistry and Biophysics University of California San Francisco San FranciscoCA94158 United States Department of Molecular Biophysics and Integrated Bioimaging Lawrence Berkeley National Laboratory BerkeleyCA94720 United States ChemPartner Corporation South San FranciscoCA94080 United States Structural Genomics Consortium University of Oxford Old Road Campus HeadingtonOX3 7DQ United Kingdom School of

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) macrodomain within the nonstructural protein 3 counteracts host-mediated antiviral adenosine diphosphate ribosylation signaling. This enzyme is a promising antiviral target because catalytic mutations render viruses nonpathogenic. Here, we report a massive crystallographic screening and computational docking effort, identifying new chemical matter primarily targeting the active site of the macrodomain. Crystallographic screening of 2533 diverse fragments resulted in 214 unique macrodomain-binders. An additional 60 molecules were selected from docking more than 20 million fragments, of which 20 were crystallographically confirmed. X-ray data collection to ultra-high resolution and at physiological temperature enabled assessment of the conformational heterogeneity around the active site. Several fragment hits were confirmed by solution binding using three biophysical techniques (differential scanning fluorimetry, homogeneous time-resolved fluorescence, and isothermal titration calorimetry). The 234 fragment structures explore a wide range of chemotypes and provide starting points for development of potent SARS-CoV-2 macrodomain inhibitors. © 2021 American Association for the Advancement of Science. All rights reserved.

关键词： Coronavirus

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Exciton Localization of High-Quality ZnO/Mg_xZn_1-xO Multiple Quantum Wells on Si (111) with a Y₂O₃ Buffer Layer (vol 1, pg 3829, 2018)

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ACS APPLIED NANO MATERIALS 2018年第10期1卷 5958-5958页

作者： Liu, Wei-Rein Huang, Wei-Lun Wu, Yung-Chi Lai, Liang-Hsun Hsu, Chia-Hung Hsieh, Wen-Feng Chiang, Tsung-Hung Wan, H. W. Hong, M. Kao, J. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Materials Science & Engineering National Tsing Hua University Hsinchu 30013 Taiwan Graduate Institute of Applied Physics and Department of Physics National Taiwan University Taipei 10617 Taiwan Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan

We report the structural and optical properties of ten-period ZnO/MgxZn1–xO multiple quantum wells (MQWs) prepared on the most widely used semiconductor material, Si. The introduction of a nanometer thick high-k Y2O3transition layer between Si (111) substrate and a ZnO buffer layer significantly improves the structural perfection of the MQWs grown on top of it. The high structural quality of the ZnO/MgxZn1–xO MQWs is evidenced by the appearance of pronounced high order satellite peaks in X-ray crystal truncation rods; high resolution cross-sectional transmission electron microscopy images also confirmed the regularly arranged well and barrier layers. When the well width is less than ∼2.7 nm, the quantum-confined Stark effect in MQWs can be negligible. Not only the increasing exciton-binding energy but also reducing exciton–phonon coupling determined in temperature-dependent photoluminescence spectra indicate quantum-size effect. Our results demonstrate that ZnO/MgxZn1–xO MQWs integrated on Si have great potential in UV optoelectronic device applications.

关键词： Excitons Phonons Oxides Binding energy Layers

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Kramers nodal lines in intercalated TaS2 superconductors

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Nature communications 2025年第1期16卷 4984页

作者： Yichen Zhang Yuxiang Gao Aki Pulkkinen Xingyao Guo Jianwei Huang Yucheng Guo Ziqin Yue Ji Seop Oh Alex Moon Mohamed Oudah Xue-Jian Gao Alberto Marmodoro Alexei Fedorov Sung-Kwan Mo Makoto Hashimoto Donghui Lu Anil Rajapitamahuni Elio Vescovo Junichiro Kono Alannah M Hallas Robert J Birgeneau Luis Balicas Ján Minár Pavan Hosur Kam Tuen Law Emilia Morosan Ming Yi Department of Physics and Astronomy Rice University Houston TX 77005 USA. New Technologies Research Center University of West Bohemia Plzen 301 00 Czech Republic. Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong China. Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX 77005 USA. Department of Physics University of California Berkeley Berkeley CA 94720 USA. National High Magnetic Field Laboratory Tallahassee Tallahassee FL 32310 USA. Physics Department Florida State University Tallahassee FL 32306 USA. Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver Vancouver BC V6T 1Z4 Canada. Advanced Light Source Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA. Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA. National Synchrotron Light Source II Brookhaven National Lab Upton NY 11973 USA. Rice Center for Quantum Materials Rice University Houston TX 77005 USA. Department of Electrical and Computer Engineering Rice University Houston TX 77005 USA. Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA. Smalley-Curl Institute Rice University Houston TX 77005 USA. Department of Physics & Astronomy University of British Columbia Vancouver Vancouver BC V6T 1Z1 Canada. Canadian Institute for Advanced Research Toronto Toronto ON M5G 1M1 Canada. Materials Science Division Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA. Department of Physics and Texas Center for Superconductivity University of Houston Houston TX 77204 USA. Department of Physics and Astronomy Rice University Houston TX 77005 USA. emorosan@rice.edu. Rice Center for Quantum Materials Rice University Houston TX 77005 USA. emorosan@rice.edu. Smalley-Curl Institute Rice University Houston TX 77005 USA.

Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide superconductors with large Ising-type spin-orbit coupling, represented by InTaS, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy with spin resolution, angle-dependent quantum oscillation measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport.

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Effect of formation temperature on quality of gate dielectric on germanium substrate

Effect of formation temperature on quality of gate dielectri...

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International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： Erh-Jye Wei Bing-Yue Tsui Pin-Jiun Wu Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu Taiwan R.O.C. Department of Electronics Engineering and Institute of Electronics National Chiao Tung University Hsinchu Taiwan R.O.C. National Synchrotron Radiation Research Center (NSRRC) Hsinchu Taiwan R.O.C.

ISBN: (纸本)9781467382601

Germanium metal-insulator-semiconductor (MIS) structure with HfO 2 /Al 2 O 3 /GeO 2 gate stack have been demonstrated to exhibit good performance. In this work, the effect of formation temperature of the gate stack on the quality of the gate dielectric is investigated. It is found that the higher plasma oxidation temperature helps the GeO 2 formation and less interface states. But the higher deposition temperature of the ALD high-k films may degrade the interface and result in higher leakage current.

关键词： Failure analysis Integrated circuits Decision support systems

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Fabrication of graphene by electrochemical exfoliation in alkaline electrolytes

Fabrication of graphene by electrochemical exfoliation in al...

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作者： Chang, Li-Chung Hsieh, Yu-Chi Chen, Yong-Min Wu, Pu-Wei Lee, Jyh-Fu Graduate Program for Science and Technology of Accelerator Light Source China Department of Materials Science and Engineering National Chiao Tung University Hsin-Chu 30010 Taiwan Taiwan National Synchrotron Radiation Research Center Hsin-Chu 30076 Taiwan Taiwan

ISBN: (纸本)9781607685395

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of assynthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage. © 2014 The Electrochemical Society.

关键词： Graphene

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Fabrication of Graphene by Electrochemical Exfoliation in Alkaline Electrolytes

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ECS Transactions 2013年第24期58卷

作者： Li-Chung Chang Yu-Chi Hsieh Yong-Min Chen Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of as-synthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage.

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Fabrication of Dealloyed Pt2os Nanoparticles for Oxygen Reduction Reaction in Acidic Electrolytes

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ECS Meeting Abstracts 2013年第3期MA2013-02卷

作者： Yi-Juei Lee Yu-Chi Hsieh Yu Sun Li-Chung Chang Pu-Wei Wu Jyh-Fu Lee Department of Materials Science and Engineering National Chiao Tung University Department of Materials Science and Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsin-Chu 30076 Taiwan ROC

Abstract not Available.

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Fabrication of Graphene By Electrochemical Exfoliation in Alkaline Electrolytes

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ECS Meeting Abstracts 2013年第41期MA2013-02卷

作者： Li-Chung Chang Yu-Chi Hsieh Yong-Min Chen Pu-Wei Wu Jyh-Fu Lee Graduate Program for Science and Technology of Accelerator Light Source National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 Department of Materials Science and Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu City Taiwan 300 National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsin-Chu 30076 Taiwan ROC

Abstract not Available.

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XAS Study of Core-Shell PtRu Nanoparticles from Galvanic Pulse Current Deposition

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ECS Meeting Abstracts 2012年第45期MA2012-02卷

作者： Yu-Chi Hsieh Li-Chung Chang Pu-Wei Wu Jyh-Fu Lee National Chiao Tung University Graduate Program for Science and Technology of Accelerator Light Source Department of Materials Science and Engineering National Chiao Tung University National Synchrotron Radiation Research Center

Abstract not Available.

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