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Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

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National Science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu Jang Shuaifei Guo Ya-Jun yan Jingjing Gao Yijun yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo yu Ping Sun Zhongkai liu Dong-Lai Feng Xianhui Chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan yuanbo Zhang State Key Laboratory of surface physics New Cornerstone Science Laboratory and Department of PhysicsFudan University shanghai Qi Zhi institute shanghai Research Center for Quantum Sciences institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea institute for Advanced Study School of Emerging Technology and Department of physics University of Science and Technology of China Advanced light Source Lawrence Berkeley National Laboratory shanghaiTech Laboratory for Topological physics Key Laboratory of Materials physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2.hat defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition

动态热风辅助再结晶策略改善CsPbI_(2.Br钙钛矿在大气环境下的结晶及其光电性能

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物理学报 2024年第9期73卷 326-335页

作者：张子发袁翔鹿颖申何丹敏严全河曹浩宇洪峰蒋最敏徐闰马忠权宋宏伟徐飞上海大学理学院上海市高温超导重点实验室上海200444 复旦大学物理系应用表面物理国家重点实验室上海200433 上海大学电子信息材料系上海200444

CsPbI_(2.Br薄膜在大气环境下制备存在覆盖率低、结晶质量差和结构稳定性差等问题.本文提出了一种动态热风辅助再结晶策略(dynamic hot-air assisted recrystallization,DHR),在相对湿度大于60%(>60%RH)的大气环境下,制备出高覆盖率、(1... 详细信息

CsPbI_(2.Br薄膜在大气环境下制备存在覆盖率低、结晶质量差和结构稳定性差等问题.本文提出了一种动态热风辅助再结晶策略(dynamic hot-air assisted recrystallization,DHR),在相对湿度大于60%(>60%RH)的大气环境下,制备出高覆盖率、(100)择优取向、大尺寸晶粒、结构稳定、光电性能好的CsPbI_(2.Br薄膜.这是由于动态热风过程能够有效提高薄膜的覆盖率和获得(100)择优取向的结晶,但晶粒尺寸会显著减小(R_(ave)=0.32.m)并伴随着大量的晶界形成,从而加剧载流子的非辐射复合(τ_(ave)=99 ns);而通过再结晶过程,可进一步提高(100)择优取向的结晶和显著增大晶粒尺寸(R_(ave)=2.63μm),从而提高薄膜的光致发光强度和荧光寿命(τ_(ave)=118 ns).由DHR策略制备的未封装CsPbI_(2.Br太阳能电池具备高光电转换效率(power conversion efficiency,PCE=17.55%)、低迟滞因子(hysteresis index,HI=2.34%)和长期的储存稳定性(air,>60%RH,40天,初始PCE的96%)等特性.

关键词： CsPbI_(2.Br 动态热风辅助再结晶大气环境光电性能

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Experimental quantum simulation of a topologically protected Hadamard gate via braiding Fibonacci anyons

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The Innovation 2023年第5期4卷 41-46页

作者： yu-ang Fan Yingcheng li yuting Hu Yishan li Xinyue Long Hongfeng liu Xiaodong yang Xinfang Nie Jun li Tao Xin Dawei Lu Yidun Wan Shenzhen institute for Quantum Science and Engineering and Department of physics Southem University of Science and Technology Shenzhen 518055China State Key Laboratory of surface physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433and Shanghai Qi Zhi InstituteShanghai 200030China School of physics Hangzhou Normal UniversityHangzhou 311121China

Topological quantum computation(TQC)is one of the most striking architectures that can realize fault-tolerant quantum *** TQC,the logical space and the quantum gates are topologically protected,i.e.,robust against local *** topological protection,however,requires complicated lattice models and hard-to-manipulate dynamics;even the simplest system that can realize universal TQC-the Fibonacci anyon system—lacks a physical realization,let alone braiding the non-Abelian ***,we propose a disk model that can simulate the Fibonacci anyon system and construct the topologically protected logical spaces with the Fibonacci *** braiding the Fibonacci anyons,we can implement universal quantum gates on the logical *** disk model merely requires two physical qubits to realize three Fibonacci anyons at the *** 15 sequential braiding operations,we construct a topologically protected Hadamard gate,which is to date the least-resource requirement for *** showcase,we implement a topological Hadamard gate with two nuclear spin qubits,which reaches 97.18%fidelity by randomized *** further prove by experiment that the logical space and Hadamard gate are topologically protected:local disturbances due to thermal fluctuations result in a global phase *** a platform-independent proposal,our work is a proof of principle of TQC and paves the way toward fault-tolerant quantum computation.

关键词： Fibonacci Hadamard TQC

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碲化钨薄膜的红外近场光学成像

红外与毫米波学报 2022年第2期41卷 464-469页

作者：代珍兵罗国语贺言王冲晏湖根李志强四川师范大学物理与电子工程学院四川成都610066 四川大学物理学院四川成都610065 复旦大学应用表面物理国家重点实验室上海200438 复旦大学物理学系上海200438

研究了过渡金属硫族化合物碲化钨的近场光学响应,通过Drude-Lorentz模型拟合得到其块材在室温下的介电常数,并利用有限偶极模型计算出碲化钨样品与金刚石基底的近场散射信号比。当样品边缘未出现散射信号增强时,实验结果与理论模型符合... 详细信息

研究了过渡金属硫族化合物碲化钨的近场光学响应,通过Drude-Lorentz模型拟合得到其块材在室温下的介电常数,并利用有限偶极模型计算出碲化钨样品与金刚石基底的近场散射信号比。当样品边缘未出现散射信号增强时,实验结果与理论模型符合较好;当样品边缘出现信号增强现象时,理论模型与实验观测结果不符,说明这部分样品的光学性质并不能完全由块材所描述,从而推测样品表面具有与块材无耦合作用的碲化钨纳米薄层,同时对在样品边缘很强的近场散射信号给出了可能的解释。这个工作为今后对拓扑材料的光学研究提供了参考。

关键词：碲化钨薄膜近场光学成像介电常数拓扑

Optical properties and polaritons of low symmetry 2. materials

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Photonics Insights 2023年第1期2卷 92-143页

作者： Shenyang Huang Chong Wang yuangang Xie Boyang yu Hugen yan institute of Optoelectronics Fudan UniversityShanghaiChina State Key Laboratory of surface physics Key Laboratory of Micro and Nano-Photonic Structures of the Ministry of Educationand Department of PhysicsFudan UniversityShanghaiChina Centre for Quantum physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement of the Ministry of EducationSchool of PhysicsBeijing Institute of TechnologyBeijingChina Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijingChina

Low symmetry 2. materials with intrinsic in-plane anisotropic optical properties and high tunability provide a promising platform to explore and manipulate light–matter *** date,dozens of in-plane anisotropic 2. materials with diverse band structures have been *** exhibit rich optical properties,indicating great potential for novel applications in optics,photonics,and *** this paper,we thoroughly review the anisotropic optical properties and polaritons in many kinds of low symmetry 2. materials,aiming to elicit more research interest in this ***,the optical properties of anisotropic 2. semiconductors,including interband absorption,photoluminescence,excitons,and band structure engineering for tuning optical responses,are *** fundamentals and advances in experiments of hyperbolic polaritons in anisotropic 2. materials,including phonon,plasmon,and exciton polaritons,are ***,a perspective on promising research directions is given.

关键词： anisotropic 2. materials optical properties hyperbolic polaritons

Comparison of aerosol characteristics during haze periods over two urban agglomerations in China using CAliPSO observations

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Particuology 2017年第4期15卷 63-72页

作者： Qiong liu Xiaojun Ma yanrong yu yan Qin Yonghang Chen yanming Kang Hua Zhang Tiantao Cheng yan ling yujie Tang College of Environmental Science and Engineering Donghua University Shanghai 201620 China shanghai Key Laboratory of Atmospheric Particle PolluHon and Prevention (LAP3) Department of Environmental Science and Engineering Fudan University Shanghai 200433 China College of physics and Electrical Information Engineering Ningxia University Yinchuan 750021 China institute of Desert Meteorology China Meteorology Administration. Urumqi 830002 China National Climate Center China Meteorology Administration Belting 100081 China

Using CAliPSO （cloud-aerosol lidar and infrared pathfinder satellite observation） vertical observation data during haze periods from January 2.07 to December 2.08, we analyzed differences in aerosol char- acteristics near the surface, as well as in the middle troposphere between the Beijing-Tianjin-Hebei metropolitan region （Area A） and the yangtze River Delta region （Area B） in China. One significant dif- ference was that haze pollution in Area A was related to local and non-local aerosols, while in Area B it was related to local anthropogenic sources. In all seasons apart from autumn, aerosol pollution in Area A was more severe than in Area B, both near the surface and at higher altitudes, In Area A, non-spherical aerosols were dominant from 0 to 4 km in spring, summer, and winter; while in autumn, there were con- siderably high numbers of non-spherical aerosols below 0.5 km, and near-spherical aerosols from 0.5 to 4 km. In Area B, both near-spherical and non-spherical aerosols were common in all seasons. Moreover, aerosols with attenuated color ratios of 0-0.2.were more common in all seasons in Area A than in Area B, indicating that fine particle pollution in Area A was more serious than in Area B. Finally, relatively large aerosols linked to gravity settling appeared more frequently near the surface in Area A than in Area B.

关键词： CAliPSO Aerosols Haze Vertical distribution Seasonal variation Urban agglomerations

Impact of the dielectric duty factor on magnetic resonance in Ag-SiO_(2.-Ag magnetic absorber

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Optoelectronics Letters 2021年第1期17卷 5-11页

作者：王玉颖李晶苏富芳孙学博张旭李妍张霞 Shandong Provincial Key Laboratory of Laser Polarization and Information Technology School of Physics and Physical EngineeringQufu Normal UniversityQufu 273100China surface physics State Laboratory and Department of physics Fudan UniversityShanghai 200433China

Magnetic absorber in optical frequency can be fulfilled through metamaterials designing. Therein, magnetic resonance in metal-dielectric-metal metasurfaces can be manipulated conveniently, and studying the parameters impacts is the primary for applications. In this work, through changing the grating width and the thickness of silica, the magnetic resonance modes have been studied, the conditions of the phase change zone from magnetic resonance(MR) to Fabry-Pérot(FP) are given out in Ag-SiO_(2.-Ag grating magnetic metasurfaces. The results indicate that the MR mode in metal-dielectric-metal configuration is mainly decided on the dielectric duty factor other than the sole behaviors of the thickness of dielectric and size of nanostructures. The physical mechanism is elucidated through simulated electromagnetic field distributions using finite difference time domain(FDTD) solution, and numerical analysis of effective refraction index of Ag-SiO_(2.-Ag magnetic metasurfaces. This study may prompt development of metamaterials in basic research in condensed physics and in optical devices applications.

关键词： dielectric magnetic absorber

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe2.e(4/3)

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Chinese physics B 2018年第6期27卷 87-91页

作者：贾小雨俞云杰陈旭郭建刚应天平何兰坡陈小龙李世燕 State Key Laboratory of surface physics Department of Physicsand Laboratory of Advanced MaterialsFudan UniversityShanghai 200433China Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Collaborative Innovation Center of Quantum Matter Beijing 100084China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

We performed ultra-low temperature thermal conductivity measurements on the single crystal of a new gold-based quasi-two-dimensional superconductor Au Te2.e（4/3）, which has a superconducting transition temperature Tc = 2.70 K. A negligible residual linear term κ0/T in zero magnetic field is observed, which suggests fully gapped superconducting ***, the field dependence of κ0/T is similar to that of the multi-band s-wave superconductor Ba Fe1.9 Ni0.1 As2.at low field. These results reveal multiple nodeless superconducting gaps in this interesting quasi-two-dimensional superconductor with Berezinsky–Kosterlitz–Thouless topological transition.

关键词： superconductivity thermal transport measurement gap structure two-dimensional material

Understanding the dynamical-microphysical-electrical processes associated with severe thunderstorms over the Beijing metropolitan region

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Science China Earth Sciences 2021年第1期64卷 10-26页

作者： Xiushu QIE Shanfeng yuAN Zhixiong CHEN Dongfeng WANG Dongxia liU Mengyu SUN Zhuling SUN Abhay SRIVASTAVA Hongbo ZHANG Jingyu LU Hui XIAO Yongheng BI liang FENG Ye TIAN yan XU Rubin JIANG Mingyuan liU Xian XIAO Shu DUAN Debin SU Chengyun SUN Wenjing XU Yijun ZHANG Gaopeng LU Da-lin ZHANG yan YIN Ye yu Key Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO) Institute of A tmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Cloud-Precipitation physics and Severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China College of Atmospheric Science Chengdu University of Information TechnologyChengdu 610225China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory of Land surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Earth and Planetary Science University of Chinese Academy of ScienceBeijing 100049China Meteorological Observation Centre Beijing Meteorological BureauBeijing 100081China Jiangxi Weather Modification Nanchang 330096China Department of Atmospheric and Oceanic Sciences&institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Department of Atmospheric and Oceanic Science University of MarylandMaryland 20742USA

The Dynamical-microphysical-electrical Processes in Severe Thunderstorms and lightning Hazards(STORM973)project conducted coordinated comprehensive field observations of thunderstorms in the Beijing metropolitan region(BMR)during the warm season from 2.14 to *** aim of the project was to understand how dynamical,microphysical and electrical processes interact in severe thunderstorms in the BMR,and how to assimilate lightning data in numerical weather prediction models to improve severe thunderstorm *** platforms used in the field campaign included the Beijing lightning Network(BLNET,consisting of 16 stations),2.X-band dual linear polarimetric Doppler radars,and 4 laser raindrop *** collaboration also made use of the China Meteorological Administration’s mesoscale meteorological observation network in the Beijing-Tianjin-Hebei *** diverse thunderstorm types were documented,it was found that squall lines and multicell storms were the two major categories of severe thunderstorms with frequent lightning activity and extreme rainfall or unexpected local short-duration heavy rainfall resulting in inundations in the central urban area,influenced by the terrain and environmental *** flash density maximums were found in eastern Changping District,central and eastern Shunyi District,and the central urban area of Beijing,suggesting that the urban heat island effect has a crucial role in the intensification of thunderstorms over *** addition,the flash rate associated with super thunderstorms can reach hundreds of flashes per minute in the central city *** super(5%of the total),strong(35%),and weak(60%)thunderstorms contributed about 37%,56%,and 7%to the total flashes in the BMR,*** to the close connection between lightning activity and the thermodynamic and microphysical characteristics of the thunderstorms,the lightning flash rate can be used as an indicator of severe weather events,such as hail

关键词： lightning 3D location Dual linear polarimetric Doppler radar Severe thunderstorm lightning data assimilation Hail Short-term heavy precipitation