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International Conference on vacuum Electronics

作者： Hexin Wang Hui Zhang Zhencheng Mu Shaomeng Wang Zhanliang Wang Zhaoyun Duan Yang Yang Yubin Gong Spallation Neutron Source Science Center Institute of High Energy Physics Chinese Academy of Sciences (IHEP-CAS) Dongguan China National Key Laboratory of Science and Technology on Vacuum Electronics University of Electronic Science and Technology of China (UESTC) Chengdu China International School of Microelectronics Dongguan University of Technology Dongguan China

The beam-wave interaction characteristics of a novel planar SWS for W-band TWT is studied. The SWS is mainly composed by meander metal line, which leads a convenient fabrication process. The simulation results show that at 96 GHz the output power of 66 W could be obtained, the corresponding small signal gain is 21.2 dB, and the electronic efficiency is 11.7%, where the working voltage is 11.3 kV. In addition, the design of electron optical systems is also studied by using PCM focusing system. The simulation results show that 97.7 % of the electron transmission rate can be achieved in a 20 mm long electron beam channel.

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Mid-infrared Photons Released by NAD^(+)Reduction in the Tricarboxylic Acid Cycle of Myelinated Neuron

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Neuroscience Bulletin 2023年第7期39卷 1146-1150页

作者： Daoling Peng Wenpeng Qi Feng Zhang Bo Song Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationSchool of EnvironmentSouth China Normal UniversityGuangzhou 510006China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Key Laboratory of Optical Technology and Instruments for Medicine Ministry of EducationShanghai Key Lab of Modern Optical SystemsSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Dear Editor,Life can utilize energy with high efficiency,especially with the help of aerobic respiration,where the tricarboxylic acid(TCA)cycle acts as an important metabolic engine for mitochondria to produce the cell energy currency of adenosine triphosphate(ATP),and nicotinamide adenine dinucleotide(NAD)plays a particular role of energy management molecule in the TCA cycle[1].

关键词： carboxylic utilize cycle

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Electron-phonon coupling in the charge density wave state of CsV3Sb5

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Physical Review B 2022年第14期105卷 L140501-L140501页

作者： Yaofeng Xie Yongkai Li Philippe Bourges Alexandre Ivanov Zijin Ye Jia-Xin Yin M. Zahid Hasan Aiyun Luo Yugui Yao Zhiwei Wang Gang Xu Pengcheng Dai Department of Physics and Astronomy Rice University Houston Texas 77005 USA Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 China Laboratoire Léon Brillouin CEA-CNRS Université Paris-Saclay CEA Saclay 91191 Gif-sur-Yvette France Institut Laue-Langevin 71 avenue des Martyrs CS 20156 38042 Grenoble Cedex 9 France Wuhan National High Magnetic Field Center & School of Physics Huazhong University of Science and Technology Wuhan 430074 China Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Princeton Institute for Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Metallic materials with kagome lattice structure are interesting because their electronic structures can host flat bands, Dirac cones, and van Hove singularities, resulting in strong electron correlations, nontrivial band topology, charge density wave (CDW), and unconventional superconductivity. Recently, kagome lattice compounds AV3Sb5 (A=K, Rb, Cs) are found to have intertwined CDW order and superconductivity. The origin of the CDW has been suggested to arise from Fermi-surface instabilities of van Hove singularity (saddle point) near the M points with weak electron-phonon coupling. Here we use neutron scattering experiments to demonstrate that the CDW order in CsV3Sb5 is associated with static lattice distortion and a sudden hardening of the B3u longitudinal optical phonon mode at the Brillouin zone boundary, thus establishing that the wave vector dependent electron-phonon coupling must also play an important role in the CDW order of AV3Sb5.

关键词： Charge density waves Kagome lattice Inelastic neutron scattering

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JARVIS-Leaderboard:a large scale benchmark of materials design methods

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npj Computational Materials 2024年第1期10卷 2280-2296页

作者： Kamal Choudhary Daniel Wines Kangming Li Kevin F.Garrity Vishu Gupta Aldo H.Romero Jaron T.Krogel Kayahan Saritas Addis Fuhr Panchapakesan Ganesh Paul R.C.Kent Keqiang Yan Yuchao Lin Shuiwang Ji Ben Blaiszik Patrick Reiser Pascal Friederich Ankit Agrawal Pratyush Tiwary Eric Beyerle Peter Minch Trevor David Rhone Ichiro Takeuchi Robert B.Wexler Arun Mannodi-Kanakkithodi Elif Ertekin Avanish Mishra Nithin Mathew Mitchell Wood Andrew Dale Rohskopf Jason Hattrick-Simpers Shih-Han Wang Luke E.K.Achenie Hongliang Xin Maureen Williams Adam J.Biacchi Francesca Tavazza Material Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD20899USA Department of Materials Science and Engineering University of Toronto27 King’s College CirTorontoONCanada Department of Electrical and Computer Engineering Northwestern UniversityEvanstonIL 60208USA Lewis-Sigler Institute for Integrative Genomics Princeton UniversityPrincetonNJ 08544USA Ludwig Institute for Cancer Research Princeton UniversityPrincetonNJ 08544USA Department of Physics and Astronomy West Virginia UniversityMorgantownWV 26506USA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Center for Nanophase Materials Science Oak Ridge National LaboratoryOak RidgeTN 37831USA Computational Sciences and Engineering Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Computer Science and Engineering Texas A&M UniversityCollege StationTX 77843USA Globus University of ChicagoChicagoIL 60637USA Data Science and Learning Division Argonne National LabLemontIL 60439USA Institute of Nanotechnology Karlsruhe Institute of TechnologyKaiserstraße 1276131 KarlsruheGermany Institute of Theoretical Informatics Karlsruhe Institute of TechnologyKaiserstraße 1276131 KarlsruheGermany Department of Chemistry and Biochemistry and Institute for Physical Science and Technology University of MarylandCollege ParkMD 20742USA Department of Physics Applied Physics and AstronomyRensselaer Polytechnic InstituteTroyNY12180USA Department of Materials Science and Engineering University of MarylandCollege ParkMD20742USA Department of Chemistry and Institute of Materials Science and Engineering Washington University in St.LouisSt.LouisMO63130USA School of Materials Engineering Purdue UniversityWest LafayetteIN47907USA Department of Mechanical Science and Engineering University of Illinois Urbana-ChampaignUrbanaIllinois 61801USA Materials Research Laboratory University of Illinois Urbana-ChampaignUrbanaIL 61801USA Theore

Lack of rigorous reproducibility and validation are significant hurdles for scientific development across many *** science,in particular,encompasses a variety of experimental and theoretical approaches that require careful *** efforts have been developed previously to mitigate these ***,a comprehensive comparison and benchmarking on an integrated platform with multiple data modalities with perfect and defect materials data is still *** work introduces JARVIS-Leaderboard,an open-source and community-driven platform that facilitates benchmarking and enhances *** platform allows users to set up benchmarks with customtasks and enables contributions in the form of dataset,code,and meta-data *** cover the following materials design categories:Artificial Intelligence(AI),Electronic Structure(ES).

关键词： rigorous perfect enable

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Designing polymer nanocomposites with high energy density using machine learning

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npj Computational Materials 2021年第1期7卷 999-1007页

作者： Zhong-Hui Shen Zhi-Wei Bao Xiao-Xing Cheng Bao-Wen Li Han-Xing Liu Yang Shen Long-Qing Chen Xiao-Guang Li Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhanChina International School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Physics and CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of China HefeiChina Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPAUnited States School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijingChina

Addressing microstructure-property relations of polymer nanocomposites is vital for designing advanced dielectrics for electrostatic energy ***,we develop an integrated phase-field model to simulate the dielectric response,charge transport,and breakdown process of polymer ***,based on 6615 high-throughput calculation results,a machine learning strategy is schemed to evaluate the capability of energy *** find that parallel perovskite nanosheets prefer to block and then drive charges to migrate along with the interfaces in x-y plane,which could significantly improve the breakdown strength of polymer *** verify our predictions,we fabricate a polymer nanocomposite P(VDF-HFP)/Ca_(2)Nb_(3)O_(10),whose highest discharged energy density almost doubles to 35.9 J cm^(−3) compared with the pristine polymer,mainly benefit from the improved breakdown strength of 853 MVm^(−1).This work opens a horizon to exploit the great potential of 2D perovskite nanosheets for a wide range of applications of flexible dielectrics with the requirement of high voltage endurance.

关键词： polymer energy perovskite

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Influence of Yttrium(Y) on properties of Lanthanum Cobalt Oxides(LaCoO3)

arXiv

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arXiv 2024年

作者： Chowdhury, Mohammad Abu Thaher Begum, Shumsun Naher Condensed Matter Lab Department of Physics Shahjalal University of Science and Technology Sylhet3114 Bangladesh BCSIR Dhaka1205 Bangladesh

Many materials exhibit various types of phase transitions at different temperatures, with many also demonstrating polymorphism. Doping materials can significantly alter their conductivity. In light of this, we have investigated the electrical conductivity of LaCoO3, specifically its temperature dependence when doped with Yttrium (Y). The crystal structure of Lanthanum Yttrium Cobalt oxide (La1-xYxCoO3) adopts a perovskite form, characterized by the general stoichiometry ABX3, where A and B are cations, and X is an anion. This material undergoes a magnetic phase transition between 50-100 K, a structural phase transition between 100 - 300 K, and an insulator-to-metal transition at 500 K. At room temperature, LaCoO3exhibits polaron-type hopping conduction. Our aim was to understand the electrical conductivity at 300 K and how it varies with temperature when La3+is replaced by Y 3+. The electrical properties of the perovskite crystal are consistent with small polaron hopping conduction, which theoretically follows Mott's variable range hopping model, where conductivity obeys an exponential law, and resistivity follows an inverse exponential pattern. In this work, we compare the experimental resistivity graph with the theoretical inverse of the conductivity graph, showing that our experimental results align with the polaron hopping conduction model within a certain range. Additionally, the experiment confirms polymorphism in various cases. We observed that increasing the concentration of Y 3+enhances the metallic properties of La1-xYxCoO3, and we found a significant correlation between conductivity and symmetry. Furthermore, the study highlights the material's phase transitions and polymorphic behavior. © 2024, CC BY.

关键词： Perovskite

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Terahertz emission from two-dimensional Ruddlesden-Popper halide perovskites driven by electric dipole and quadrupole under below-band-gap excitation

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Physical Review B 2023年第24期108卷 245403-245403页

作者： Huizhu Li Yixuan Zhou Yayan Xi Yongqiang Zou Zhen Lei Xueqin Cao Yuanyuan Huang Dehui Li Xinlong Xu Shaanxi Joint Lab of Graphene State Key Lab Incubation Base of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional Materials Institute of Photonics & Photon-Technology School of Physics Northwest University Xi'an 710069 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

Understanding the nonlinear polarization mechanism of two-dimensional (2D) halide perovskites is essential for developing various nonlinear optical applications. Herein, the terahertz (THz) emission from Ruddlesden-Popper type (BA)2PbI4 and (iso−BA)2PbI4 are investigated by both above-band-gap (400 nm) and below-band-gap (800 nm) femtosecond laser excitation. Under above-band-gap excitation, the dominant mechanism is the linear photogalvanic effect instead of the common photo-Dember effect and surface depletion field effect, suggesting the carrier transport between adjacent conductor layers is forbidden by the organic layers. Under below-band-gap excitation, the THz emission from orthorhombic (BA)2PbI4 exhibits a remarkable quadruple rotational symmetry on the azimuthal angle, indicating that the nonlinear polarization is driven by a higher-order electric quadrupole term instead of the bulk electric dipole term, which is forbidden by the centrosymmetric structure. In comparison, the low symmetry of THz emission on the azimuthal angle of monoclinic (iso−BA)2PbI4 is attributed to the influence of symmetry breaking in the surface region, which raises a surface electric dipole contribution. In this paper, we reveal THz emission spectroscopy as a powerful contactless technique in investigating the nonlinear polarization of advanced materials.

关键词： Light-matter interaction Electric moment Polarization Femtosecond laser spectroscopy

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Enhancing analogue Unruh effect via superradiance in a cylindrical cavity

arXiv

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arXiv 2024年

作者： Zheng, Hong-Tao Zhou, Xiang-Fa Guo, Guang-Can Zhou, Zheng-Wei CAS Key Lab of Quantum Information and Anhui Center for fundamental sciences in theoretical physics University of Science and Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China

We propose a scheme to detect the Unruh effect in a circularly rotated Unruh-DeWitt detector enclosed within a cylindrical cavity. This technique relies on the enhanced atomic spontaneous emission rate related to the counter-rotating coupling between the detector and massless scalar fields. Our analysis demonstrates that the integration of a cylindrical cavity, coherent light excitation, and multi-atom super-radiation significantly enhances the signal strength, as the radiation rate associated with the standard rotating-wave coupling can be greatly suppressed within the cavity. Compared to linear acceleration, circular motion can significantly reduce the atomic acceleration path length, leading to increased detection efficiency and lower experimental difficulty. Our method provides a novel avenue for exploring relativistic effects on a compact, tabletop platform. © 2024, CC BY.

关键词： Atoms

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Van der Waals epitaxy of ultrathin crystalline PbTe nanosheets with high near-infrared photoelectric response

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Nano Research 2021年第6期14卷 1955-1960页

作者： Xinxin Zhao Qing Yin Hao Huang Qiang Yu Bo Liu Jie Yang Zhuo Dong Zhenjiang Shen Benpeng Zhu Lei Liao Kai Zhang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei230026China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou215123China Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou215123China School of Physics and Technology Wuhan UniversityWuhan430072China The Institute of Scientific and Industrial Research Osaka UniversityOsaka567-0047Japan College of Physics and Electronic Engineering Hainan Normal UniversityHaikou571158China School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan430074China

Lead telluride(PbTe)is one of the reliable candidates for infrared(IR)optoelectronics with optimum band-gap as well as excellent photoelectric *** interests had been paid on the growth and device applications with PbTe for the development of high-performance IR photodetectors especially those working in the near-infrared *** a great deal of effort had been made to prepare PbTe nanostructures for miniaturized detectors,it is difficult to synthesize high-quality two-dimensional(2D)PbTe crystals due to its rock-salt non-layered ***,a facile strategy for controllable synthesis of ultrathin crystalline PbTe nanosheets by van der Waals epitaxy is *** an optimized growth temperature,which determines the morphology transit from triangular pyramid islands to regular square 2D planars,PbTe nanosheets in lateral size of tens of microns with thickness down to~7 nm are ***,ultrasensitive near-infrared detectors(NIRDs)based on the as-grown 2D PbTe nanosheets have been demonstrated with an ultrahigh responsivity exceeding 3,847 A/W at the wavelength of 1,550 nm under room *** approach demonstrates that 2D PbTe nanosheets have great latent capacity of developing high-performance miniaturized IR optoelectronic devices.

关键词： two-dimensional materials van der Waals epitaxy lead telluride near-infrared photodetector

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MPd5 kagome superconductors studied by density functional calculations

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Physical Review B 2025年第14期111卷 144511-144511页

作者： Dan Li Zhengxuan Wang Panshi Jing Mehrdad Shiri Kun Wang Chunlan Ma Shijing Gong Chuanxi Zhao Tianxing Wang Xiao Dong Lin Zhuang Wuming Liu Yipeng An School of Physics Henan Normal University Xinxiang 453007 China Department of Physics University of Miami Coral Gables Florida 33146 USA School of Physics and Technology Suzhou University of Science and Technology Suzhou 215009 China Department of Physics East China Normal University Shanghai 200062 China Department of Physics Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou 510632 China State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-Sen University Guangzhou 510275 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration Henan Normal University Xinxiang 453007 China

Kagome materials, which are composed of hexagons tiled with a shared triangle, have inspired enormous interest due to their unique structures and rich physical properties; exploring superconducting material systems with new kagome structures is still an important research direction. Here, we predict a type of kagome superconductor, MPd5 (M is a group-IIA metal element), and identify that it exhibits coexistence of superconductivity and nontrivial topological properties. We uncover its phonon-mediated superconductivity by the density functional theory for superconductors, predicting the superconducting transition temperatures (Tc) of 2.64, 2.03, and 1.50 K for CaPd5, SrPd5, and BaPd5, respectively. These Tc can be effectively tuned through the application of external pressure and electron doping. The present results also demonstrate that MPd5 have topological properties; e.g., CaPd5 shows topological nontrivial intersection near the Fermi level (EF). Our results indicate that MPd5 materials can be an emerging material platform with rich exotic physics in their kagome structures, and render themselves excellent candidates for superconducting and advanced functional materials that could be utilized in topological quantum computing and information technology.

关键词： Organic superconducting materials

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