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Surface-termination-dependent electronic states in kagome superconductors AV3Sb5 (A=K, Rb, Cs) studied by micro-ARPES

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Physical Review B 2023年第24期107卷 245143-245143页

作者： Takemi Kato Yongkai Li Min Liu Kosuke Nakayama Zhiwei Wang Seigo Souma Miho Kitamura Koji Horiba Hiroshi Kumigashira Takashi Takahashi Yugui Yao Takafumi Sato Department of Physics Graduate School of Science Tohoku University Sendai 980-8578 Japan Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 People's Republic of China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 People's Republic of China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 People's Republic of China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 People's Republic of China Precursory Research for Embryonic Science and Technology (PRESTO) Japan Science and Technology Agency (JST) Tokyo 102-0076 Japan Center for Science and Innovation in Spintronics (CSIS) Tohoku University Sendai 980-8577 Japan Advanced Institute for Materials Research (WPI-AIMR) Tohoku University Sendai 980-8577 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan National Institutes for Quantum Science and Technology (QST) Sendai 980-8579 Japan Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Tohoku University Sendai 980-8577 Japan International Center for Synchrotron Radiation Innovation Smart (SRIS) Tohoku University Sendai 980-8577 Japan Mathematical Science Center for Co-creative Society (MathCCS) Tohoku University Sendai 980-8578 Japan

Recently discovered kagome superconductors AV3Sb5 (A=K, Rb, Cs) exhibit exotic bulk and surface physical properties such as charge density wave (CDW) and chirality, whereas their origins remain unresolved. By using microfocused angle-resolved photoemission spectroscopy, we discovered that AV3Sb5 commonly exhibits two distinct polar surfaces depending on the termination: electron- and hole-doped ones for the A and Sb termination, respectively. We observed that the kagome-derived band shows a splitting in the A-terminated surface, while it is absent in the Sb-terminated counterpart, suggestive of a signature of the polarity-dependent CDW at the surface. Close comparison of the band-dependent splitting implies that the three-dimensional CDW structure of the K-terminated surface is different from that of the Rb- or Cs-terminated surface, suggesting the possible diversity of the CDW ground state. These results provide important insight into the origin of CDW in kagome superconductors AV3Sb5.

关键词： Charge density waves Electric polarization Electronic structure Surface & interfacial phenomena Kagome lattice Superconductors Angle-resolved photoemission spectroscopy

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Photonic THz-ISAC Demonstration with Simultaneous 120Gbit/s Communication and 2.5mm Sensing Resolution 49

Photonic THz-ISAC Demonstration with Simultaneous 120Gbit/s ...

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49th European Conference on Optical Communications, ECOC 2023

作者： Lyu, Zhidong Lu, Zuomin Yang, Zuomin Zhang, Hongqi Zhang, Changming Yang, Hang Li, Nan Bobrovs, Vjačeslavs Ozolins, Oskars Pang, Xiaodan Yu, Xianbin College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Zhejiang Lab Hangzhou311121 China Applied Physics Department KTH Royal Institute of Technology Stockholm106 91 Sweden RISE Research Institutes of Sweden Kista164 40 Sweden Institute of Telecommunications Riga Technical University Riga1048 Latvia

ISBN: (纸本)9781839539954

We demonstrate a photonic terahertz integrated sensing and communication (THz-ISAC) system, with simultaneously achieving record-high 120 Gbit/s data rate communication and 2.5 mm range sensing resolution at 240-310 GHz band, enabled by the dual-chirp-based integrated waveform and coherent fusion processing. © The Institution of Engineering & technology 2023.

关键词： Photonic integrated circuits

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Entanglement distribution in fermion model with long-range interaction

arXiv

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arXiv 2022年

作者： Xiong, Long Huang, Yue-Xing Wu, Yu-Chun Zhang, Yong-Sheng Guo, Guang-Can Gong, Ming Key Lab of Quantum Information Chinese Academy of Sciences School of Physics University of Science Technology of China Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science Technology of China Hefei230026 China

How two-party entanglement (TPE) is distributed in the many-body systems? This is a fundamental issue because the total TPE between one party with all the other parties, CN, is upper bounded by the Coffman, Kundu and Wootters (CKW) monogamy inequality, from which CN ≤ √N − 1 can be proved by the geometric inequality. Here we explore the total entanglement C∞ and the associated total tangle τ∞ in a p-wave free fermion model with long-range interaction, showing that C∞ ∼ O(1) and τ∞ may become vanishing small with the increasing of long-range interaction. However, we always find C∞ ∼ 2ξτ∞, where ξ is the truncation length of entanglement, beyond which the TPE is quickly vanished, hence τ∞ ∼ 1/ξ. This relation is a direct consequence of the exponential decay of the TPE induced by the long-range interaction. These results unify the results in the Lipkin-Meshkov-Glick (LMG) model and Dicke model and generalize the Koashi, Buzek and Imono bound to the quantum many-body models, with much broader applicability. Copyright © 2022, The Authors. All rights reserved.

关键词： Seismic waves

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In-situ formation of layer-like Ag_(2)MoO_(4)induced by high-temperature oxidation and its effect on the self-lubricating properties of NiCoCrAlYTa/Ag/Mo coatings

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Journal of Materials science & technology 2021年第16期75卷 164-173页

作者： Enkang Hao Yulong An Jie Chen Xiaoqin Zhao Guoliang Hou Jianmin Chen Meizhen Gao Fengyuan Yan State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China China Academy of Ordnance Science Ningbo Branch Ningbo 315103China Key Lab for Magnetism and Magnetic Materials of MOE School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China

Ag-Mo-O ternary oxide has attracted growing attention because of its potential as a solid lubricant at high *** work designs and prepares NiCoCrAlYTa/Ag/Mo composite coating,performed using high velocity oxy-fuel(HVOF)spraying *** environment temperature plays an important role in the microstructure and phases as well as lubricant properties of NiCoCrAlYTa/Ag/Mo *** the environment temperature is above 600℃,the outer diffusion and oxidation of Ag and Mo lead to the formation of Ag2 MoO4 on the coating ***-like Ag2 MoO4 could form a continuous lubricant film at 800℃and consequently let the composite coating present the best tribological ***,a small number of hard particles could play a good bearing role during friction and improve the tribological properties of the composite coating.

关键词： Microstructure evolution In-situ formation Ag_(2)MoO_(4) Layer-like structure High-temperature friction

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Mechanism for ice growth on the surface of a spherical water droplet

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Physical Review B 2025年第7期111卷 075426-075426页

作者： Yang Li Prachi Parashar Iver Brevik Clas Persson O. I. Malyi Mathias Boström School of Physics and Materials Science Nanchang University Nanchang 330031 China Institute of Space Science and Technology Nanchang University Nanchang 330031 China John A. Logan College Carterville Illinois 62918 USA Department of Energy and Process Engineering Norwegian University of Science and Technology NO-7491 Trondheim Norway Department of Materials Science and Engineering KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Qingyuan Innovation Laboratory Quanzhou 362801 China Centre of Excellence ENSEMBLE3 Sp. z o. o. Wolczynska Str. 133 01-919 Warsaw Poland Chemical and Biological Systems Simulation Lab Centre of New Technologies University of Warsaw Banacha 2C 02-097 Warsaw Poland

The formation and growth of ice particles, particularly on the surfaces of spherical water droplets, bear profound implications for localized weather systems and global climate. Herein, we develop a theoretical framework for ice nucleation on minuscule water droplets, establishing that 10–5000nm droplets can considerably increase in volume, making a substantial contribution to ice formation within mist, fog, or even cloud systems. We reveal that the Casimir-Lifshitz (van der Waals) interaction within these systems is robust enough to stimulate both water and ice growth on the surfaces of ice-cold spherical water droplets. The significant impacts and possible detectable phenomena from the curvature are demonstrated.

关键词： Van der Waals forces

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A Compact X-Ray Laser with Ion Source and Crystal Cavity

arXiv

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arXiv 2024年

作者： Li, Shuang School of Electrical and Optoelectronic Engineering West Anhui University Luan237012 China Institute of Applied Physics and Computational Mathematics Beijing100088 China Shanghai EBIT Lab Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai200433 China

X-ray free-electron lasers (XFELs) are renowned for their high brightness, significantly impacting biology, chemistry, and nonlinear X-ray optics. However, current XFELs are large, expensive, and exhibit significant shot-to-shot instability. Here, we propose a novel compact apparatus for generating X-ray lasers. The setup integrates an ion source to produce highly charged ions as the gain medium. The X-ray optical cavity employs crystal Bragg diffraction for high reflectivity at large angles, and two parabolic compound refractive lenses (CRLs) focus the X-rays. Pumping is achieved through electron collision excitations. This X-ray laser offers compact dimensions, reduced costs, and enhanced coherence, positioning it as a promising seed for XFELs. With further optimization, this device has the potential to rival XFELs and revolutionize both scientific research and industrial applications. © 2024, CC BY-NC-ND.

关键词： X ray lasers

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Electronic Structure of Ta2O5 Polymorphs: Variation Trend of Band Gap and the Role of Oxygen Vacancies

arXiv

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arXiv 2023年

作者： Tang, Hui-Min Yang, Yong School of Physical Science and Technology Guangxi Normal University Guilin541001 China Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China

We provide a systematic study on the electronic structure of a series of Ta2O5 polymorphs using standard density functional theory (DFT) calculations as well as the more accurate many-body perturbation theory within the GW approximation. For the defect-free polymorphs, the variation trend of band gap can be microscopically related to the strength of orbital hybridization, and to the macroscopic bulk formation energy. The presence of oxygen vacancies is found to have profound effects on the electronic properties near the Fermi level, notably the reduction of band gap and gap closure (insulator-to-metal transition). Furthermore, depending on the vacancy sites, the band gap of some defective system may be enlarged with comparison to its defect-free counterpart. Such an anomalous behavior originates from the unexpected formation of Ta-Ta bonds. © 2023, CC BY.

关键词： Energy gap

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Characteristics of PM_(2.5) and Its Reactive Oxygen Species in Heating Energy Transition and Estimation of Its Impact on the Environment and Health in China——A Case Study in the Fenwei Plain

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Advances in Atmospheric sciences 2023年第7期40卷 1175-1186页

作者： Zexuan WANG Hongmei XU Rong FENG Yunxuan GU Jian SUN Suixin LIU Ningning ZHANG Dan LI Tao WANG Linli QU Steven Sai Hang HO Zhenxing SHEN Junji CAO Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Loess and Quaternary Geology(SKLLQG) Key Lab of Aerosol Chemistry&PhysicsInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Agricultural Technology&Extension Central of Xi'an City Xi’an 710061China Hong Kong Premium Services and Research Laboratory KowloonHong Kong Special Administrative Region(SAR)China Division of Atmospheric Sciences Desert Research InstituteRenoNV 89512United States

To reduce the adverse effects of traditional domestic solid fuel,the central government began implementing a clean heating policy in northern China in *** coal is an alternative low-cost fuel for rural households at the present *** this study,18 households that used lump coal,biomass,and clean coal as the main fuel were selected to evaluate the benefits of clean heating transformation in Tongchuan,an energy city in the Fenwei Plain,*** indoor and personal exposure(PE)samples of fine particulate matter(PM_(2.5))were synchronically *** with the lump coal and biomass groups,the indoor PM_(2.5)concentration in the clean coal group is 43.6%and 20.0%lower,respectively,while the values are 16.8%and 21.3%lower,respectively,in the personal exposure ***_(2.5)-bound elements Cd,Ni,Zn,and Mn strongly correlated with reactive oxygen species(ROS)levels in all fuel groups,indicating that transition metals are the principal components to generate oxidative *** a reliable estimation method,it is predicted that after the substitution of clean coal as a household fuel,the all-cause,cardiovascular,and respiratory disease that causes female deaths per year could be reduced by 16,6,and 3,respectively,in the lump coal group,and 22,8,and 3,respectively,in the biomass *** though the promotion of clean coal has led to impressive environmental and health benefits,the efficiencies are still *** environmental-friendly energy sources must be promoted in the rural regions of China.

关键词： clean energy transition solid fuel combustion PM_(2.5) ROS Fenwei Plain

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Boosting Acetone Response of P-Type Co 3O 4 Sensor Via Sn and Ni Co-Doping for Diabetes Diagnosis

SSRN

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SSRN 2024年

作者： Ji, Xiaohua Chang, Junqing Deng, Zanhong Shen, Chengyin Li, Meng Wang, Shimao You, Libing Kumar, Mahesh Fang, Xiaodong Meng, Gang Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Anhui Provincial Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine Mechanics Key Lab of Photovoltaic and Energy Conservation Materials Chinese Academy of Sciences Hefei230031 China Advanced Laser Technology Laboratory of Anhui Province Hefei230037 China Anhui Province Key Laboratory of Medical Physics and Technology Institute of Health and Medical Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China College of New Materials and New Energies Shenzhen Technology University Shenzhen518118 China Department of Electrical Engineering Indian Institute of Technology Jodhpur Jodhpur342011 India

The hole accumulation layer (HAL) configuration of p-type oxides (including Co3O4) in ambient air causes intrinsically low gas response and hinders their promising applications in exhaled gas analysis. Herein, Sn and Ni co-doping has been proposed to trigger the response of chemiresistive Co3O4 sensor toward acetone (biomarker of diabetes). Via incorporating 1 at% Sn and 0.5 at% Ni doping (Co2.55Sn0.03Ni0.015O4), the response to 100 ppm acetone has been boosted about 2 orders (from 4.1 to 125.6), the limit of detection (LoD) has been reduced ~4 times (from 47.9 to 12.4 ppb), the optimal operation temperature has been decreased from 130 °C to ~70 °C. Various characterizations suggest that co-doping induced abundant surface asymmetric oxygen vacancy defects (Co--Ni, Sn--Ni), which facilitate the catalytic oxidation of acetone molecules at relatively low operation temperature. In addition to excellent reproducibility and long-term stability, Co2.55Sn0.03Ni0.015O4 sensor could also operate under highly humid air background and reliably detect acetone concentration in exhaled breath at 150 °C, opening the opportunity for the practical application of p-type oxide sensors for diabetes diagnosis. © 2024, The Authors. All rights reserved.

关键词： Acetone

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高硬度六亚甲基四胺基无金属钙钛矿单晶及其高性能X射线探测

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science China Materials 2024年第4期67卷 1348-1355页

作者：宋鑫李特伦李昊瑾林舒怡殷骏赵奎 Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China Advanced Membranes and Porous Materials Center(AMPM) King Abdullah University of Science and Technology(KAUST)Physical Sciences and Engineering Division(PSE)Thuwal 23955-6900Saudi Arabia Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China

无金属卤化物钙钛矿(MFHaP)因其出色的光电性质、化学兼容性、轻量级特征和环保性能,受到了广泛关注.传统的MFHaPs材料主要是在A位采用DABCO^(2)+(1,4-二氮杂二环[2.2.2]辛烷)及其衍生物和B位采用铵根离子组成的,这种结构一般都有较低... 详细信息

无金属卤化物钙钛矿(MFHaP)因其出色的光电性质、化学兼容性、轻量级特征和环保性能,受到了广泛关注.传统的MFHaPs材料主要是在A位采用DABCO^(2)+(1,4-二氮杂二环[2.2.2]辛烷)及其衍生物和B位采用铵根离子组成的,这种结构一般都有较低的硬度和高的离子迁移.为了克服这些难题,我们通过在A位引入了笼状有机阳离子六亚甲基四胺(hmta^(2+)),成功合成了具有较高机械硬度(1.5 GPa)的hmtaNH_(4)Br_(3)单晶.这主要得益于hmta-NH_(4)Br_(3)单晶中较短的氢键和更接近1的容忍因子.此外,hmta-NH_(4)Br_(3)单晶还表现出优异的结构稳定性和环境稳定性.采用低缺陷hmta-NH_(4)Br_(3)单晶构建的X射线探测器不仅大幅减少了离子迁移,还实现了150μC Gyair^(-1)cm^(-2)的高灵敏度,展现了其在高能辐射检测领域的巨大潜力.

关键词：六亚甲基四胺离子迁移金属卤化物有机阳离子环境稳定性 X射线探测钙钛矿高能辐射

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