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Multiband nodeless superconductivity near the charge-density-wave quantum critical point in Zrte(3-x)Sex

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Chinese physics B 2016年第7期25卷 89-92页

作者：崔珊何兰坡洪晓晨朱相德 Cedomir Petrovic 李世燕 State Key laboratory of Surface physics Department of Physics and Laboratory of Advanced MaterialsFudan University High Magnetic Field laboratory Chinese Academy of Sciences and University of Science and Technology of China Condensed Matter physics and Materials science department Brookhaven National Laboratory Collaborative Innovation Center of Advanced Microstructures

It was found that selenium doping can suppress the charge-density-wave（CDW） order and induce bulk superconductivity in Zrte3. the observed superconducting dome suggests the existence of a CDW quantum critical point（QCP） in Zrte3-xSex near x ≈ 0.04. to elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two Zrte（3-x）Sex single crystals（x = 0.044 and 0.051） down to 80 m K. For both samples, the residual linear term κ0/t at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ0/t manifests a multigap behavior. these results demonstrate multiple nodeless superconducting gaps in Zrte（3-x）Sex,which indicates conventional superconductivity despite of the existence of a CDW QCP.

关键词： superconductivity charge-density-wave order thermal transport measurement gap structure

Doping Evolution of the Superconducting Gap Structure in Heavily Hole-Doped Ba1-xKxFe2As2:a Heat transport Study

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Chinese physics Letters 2015年第12期32卷 131-134页

作者：洪晓晨王爱峰张震潘坚何兰坡罗习刚陈仙辉李世燕 State Key laboratory of Surface physics Department of Physics and Laboratory of Advanced Materials Fudan University Shanghai 200433 Hefei National laboratory for Physical science at Microscale and department of physics University of Science and Technology of China Hefei 230026 Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai 200433 Collaborative Innovation Center of Advanced Microstruetures Nanjing University Nanjing 210093

We perform systematic thermal conductivity measurements on heavily hole-doped Ba1-xKxFe2As2 single crystals with 0.747 ≤ x ≤ 0.974. At x=0.747, the K0/t is negligible, indicating a nodeless superconducting gap. A small residual linear term K0/t （=0.035 m W.K-2 cm-1） appears at xz0.826, and it increases slowly up to x=0.974, followed by a substantial increase of more than 20 times to of K0/t clearly shows that the nodal gap appears near x surface topology. the small values of K0/t from x=0.826 the pure KFe2As2 （x=1.0）. this doping dependence = 0.8, possibly associated with the change of Fermi to 0.974 are consistent with the Y-shaped nodal s- wave gap recently revealed by angle-resolved photoemission spectroscopy experiments at x=0.9. Furthermore, the substantial increase of K0/t from x=0.974 to 1.0 is inconsistent with a symmetry-imposed d-wave gap in KFe2 As2, and a possible nodal gap structure in KFe2As2 is discussed.

关键词： As Doping Evolution of the Superconducting Gap Structure in Heavily Hole-Doped Ba x)KxFe2As2:a Heat transport Study

Manipulating electromagnetic waves with metamaterials: Concept and microwave realizations

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Chinese physics B 2014年第4期23卷 52-63页

作者：何琼孙树林肖诗逸李欣宋争勇孙午炯周磊 State Key laboratory of Surface physics and Key laboratory of Micro and Nano Photonic Structures Ministry of Education) Fudan University department of Optical science and Engineering and Shanghai Ultra-Precision Optical Manufacturing Engineering CenterFudan University

Our recent efforts in manipulating electromagnetic （EM） waves using metamaterials （MtMs） are reviewed with em- phasis on 1） manipulating wave polarization and transporting properties using homogeneous MtMs, 2） manipulating surface-wave properties using plasmonic MtMs, and 3） bridging propagating and surface waves using inhomogeneous meta-surfaces. For all these topics, we first illustrate the physical concepts and then present several typical practical real- izations and applications in the microwave regime.

关键词： metamateials inhomogeneous meta-surface polarization control light-matter interaction

Correlative properties of relativistic magnetic plasmas

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Chinese science Bulletin 1995年第15期40卷 1314-1316页

作者：陆全康 t. D. lee physics laboratory and Plasma physics laboratory Fudan University Shanghai 200433 Institute of physics Institute of Theoretical Physics. Chinese Academy of Sciences. Beijing 100080 China

A method for calculating correlative Green functions of relativistic plasmas is given inref. [1]. the nude particle Green function ofa relativistically magnetized plasma is obtainedin this note. As shown in fig. 1, th... 详细信息

关键词： relativistic magnetized plasma nude particle Green function.

Superconductivity in self-flux-synthesized single crystalline R2Pt3Ge5(R=La,Ce,Pr)

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Chinese physics B 2017年第5期26卷 357-361页

作者：盛琪张建黄百畅丁兆峰彭小冉谭程殳蕾 State Key laboratory of Surface physics Department of Physics Fudan University Collaborative Innovation Center of Advanced Microstructures

In order to study the basic superconductivity properties of R2Pt3Ge5, we synthesized the single crystalline samples by the Pt–Ge self-flux method. R2Pt3Ge5（R = La, Ce） were also grown for a systematic study. Zero-resistivity was observed in both the La-and Pr-based samples below the reported superconducting transition temperatures. However, magnetic susceptibility measurements showed low superconductivity volume fractions in both La2Pt3Ge5 and R2Pt3Ge5（less than2%）. Ce2Pt3Ge5 did not show any signature of superconductivity. From the specific heat measurements, we did not observe a superconducting transition peak in R2Pt3Ge5, suggesting that it is not a bulk superconductor. the magnetic susceptibility and heat capacity measurements revealed two antiferromagnetic（AFM） orders in R2Pt3Ge5 at t（N1）= 4.2 K and t（N2）= 3.5K, as well as a single AFM transition at tN= 3.8 K in Ce2Pt3Ge5.

关键词： crystalline superconductor susceptibility signature resistivity magnetization Curie impurity orders transitions

Macro-Experimental Observation of the Staggered Mode in Lattice System

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Chinese physics Letters 1995年第7期12卷 400-403页

作者： LOU Senyue YU Jun LIN Ji HUANG Guoxiang fudan t.D.lee physics laboratory Department of PhysicsFudan UniversityShanghai 200433 Institute of Modern physics Ningbo Normal CollegeNingbo 315211 department of physics Shaoxing Normal CollegeShaoxing 312000 department of physics Zhejiang Normal UniversityJinhua 321004 department of physics East China Normal UniversityShanghai 200062 Institute Pluridisciplinar Universidad ComplutensePaseo Juan XXIIINo.1Madrid 28.040Spain

the staggered mode of solitons in polyacetylene which is first discovered by Sun et *** one of the typical gap soliton studied in lattice *** a one dimensional damped and parametrically driven pendulum lattice,we have observed a stable staggered mode which can be explained successfully by a nonlinear Schrödinger equation under the multiple scale approximation.

关键词： approximation. lattice soliton

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-taSe2that 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

Quantized Conductance of Majorana Zero Mode in the Vortex of the topological Superconductor(Li_(0.84)Fe_(0.16))OHFeSe

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Chinese physics Letters 2019年第5期36卷 90-97页

作者： C.Chen Q.Liu t.Z.Zhang D.Li P.P.Shen X.L.Dong Z.-X.Zhao t.Zhang D.L.Feng State Key laboratory of Surface physics and department of physics Fudan UniversityShanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 science and technology on Surface physics and Chemistry laboratory Mianyang 621908 National laboratory of Superconductivity Institute of PhysicsChinese Academy of SciencesBeijing 100190 Hefei National laboratory for Physical science at Microscale CAS Center for Excellence in Quantum Information and Quantum Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026

the Major ana zero mode(MZM), which manifests as an exotic neutral excitation in superconductors, is the building block of topological quantum computing. It has recently been found in the vortices of several iron-based superconductors as a zero-bias conductance peak in tunneling spectroscopy. In particular, a clean and robust MZM has been observed in the cores of free vortices in(Li_(0.84)Fe_(0.16))OHFeSe. Here using scanning tunneling spectroscopy, we demonstrate that Major ana-induced resonant Andreev reflection occurs between the StM tip and this zero-bias bound state,and consequently, the conductance at zero bias is quantized as 2e^2/h. Our results present a hallmark signature of the MZM in the vortex of an intrinsic topological superconductor, together with its intriguing behavior.

关键词： OHFeSe Quantized Conductance of Majorana Zero Mode in the Vortex of the topological Superconductor MZM Li StM Fe

two-dimensional transport and strong spin-orbit interaction in SrMnSb_2

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Chinese physics B 2018年第1期27卷 203-208页

作者：凌霁玮刘彦闻金昭黄沙王伟懿张成袁翔刘姗姗张恩泽黄策 Raman Sankar Fang-Cheng Chou 夏正才修发贤 State Key laboratory of Surface physics and department of physics Fudan University Collaborative Innovation Center of Advanced Microstructures Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Center for Condensed Matter science "National" Taiwan University Institute for Nanoelectronic Devices and Quantum Computing Fudan University

We have carried out magneto-transport measurements for single crystal SrMnSb2. Clear Shubnikov-de Haas oscil- lations were resolved at relatively low magnetic field around 4 t, revealing a quasi-2D Fermi surface. We observed a development of quantized plateaus in Hall resistance （Rxy） at high pulsed fields up to 60 t. Due to the strong 2D confine- ment and layered properties of the samples, we interpreted the observation as bulk quantum Hall effect that is contributed by the parallel 2D conduction channels. Moreover, the spin degeneracy was lifted leading to Landau level splitting. the presence of anisotropic g factor and the formation of the oscillation beating pattern reveal a strong spin-orbit interaction in the SrMnSb2 system.

关键词： high field transport spin-orbit interaction anisotropic g factor bulk quantum Hall effect