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Frontiers of physics 2011年第4期6卷 410-428页

作者： Dai-xiang Mou Lin Zhao xing-jiang zhou National Laboratory for Superconductivity Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The latest discovery of a new iron-chalcogenide superconductor AXFe2-ySe2 （A =K, Cs, Rb, and Tl, etc.） has attracted much attention due to a number of its unique characteristics, such as the possible insulating state of the parent compound, the existence of Fe-vacancy and its ordering, a new form of magnetic structure and its interplay with superconductivity, and the peculiar electronic structures that are distinct from other Fe-based superconductors. In this paper, we present a brief review on the structural, magnetic and electronic properties of this new superconductor, with an emphasis on the electronic structure and superconducting gap. Issues and future perspectives are discussed at the end of the paper.

关键词： superconductor iron-chalcogenides electronic structure photoemission Fermi science superconducting gap crystal structure magnetic structure

Superconductivity in the cuprates： Deduction of mechanism for d-wave pairing through analysis of ARPES

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Frontiers of physics 2011年第4期6卷 440-449页

作者： Han-Yong Choi Chandra M. Varma xing-jiang zhou Department of Physics and Institute for Basic Science Research Sung Kyun Kwan University Suwon 440-746 Korea Department of Physics and Astronomy University of California Riverside California 92521 USA National Laboratory for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing 100190 China

In the Eliashberg integral equations for d-wave superconductivity, two different functions （α2F）n（ω, θ） and （α2F）p,d（ω） determine, respectively, the ＂normal＂ self-energy and the ＂pairing＂ self-energy, w is the frequency of fluctuations scattering the fermions whose momentum is near the Fermi-surface and makes an angle θ to a chosen axis. We present a quantitative analysis of the high-resolution laser based Angle Resolved Photoemission Spectroscopy （ARPES） data on a slightly under doped cuprate compound Bi2212 and use the Eliashberg equations to deduce the w and dependence of （α2F）n（ω, θ） for T just above Tc and below Tc. Besides its detailed w dependence, we find the remarkable result that this function is nearly independent of θ between the （π; π）-direction and 25 degrees from it, except for the dependence of the cut-off energy on 8. Assuming that the same fluctuations determine both the normal and the pairing self-energy, we ask what theories give the function （α2F）p,d（ω） required for the d-wave pairing instability at high temperatures as well as the deduced （α2F）n（θ, w）. We show that the deduced （α2F）n（θ, w） can only be obtained from antiferromagnetic （AFM） fluctuations if their correlation length is smaller than a lattice constant. Using （α2F）p,d（W） consistent with such a correlation length and the symmetry of matrix-elements scatter- ing fermions by AFM fluctuations, we calculate Tc and show that AFM fluctuations are excluded as the pairing mechanism for d-wave superconductivity in cuprates. We also consider the quantumcritical fluctuations derived microscopically as the fluctuations of the observed loop-current order discovered in the under-doped cuprates, and which lead to the marginal Fermi-liquid properties in the normal state. We show that their frequency dependence and the momentum dependence of their matrix-elements to scatter fermions are consistent with the θ and w dependence of the deduced （α2F）n（ω, θ）. The pairing kernel （α2F）p,d（W） calculated using

关键词： high temperature superconductivity mechanisms of superconductivity

Preparation of Superconducting Thin Films of Infinite-Layer Nickelate Nd_(0.8)Sr_(0.2)NiO_(2)

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Chinese Physics Letters 2021年第7期38卷 136-139页

作者： Qiang Gao Yuchen Zhao xing-jiang zhou Zhihai Zhu National Lab for Superconductivity Beijing National laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Academy of Quantum Information Sciences Beijing 100193China Songshan Lake Materials Laboratory Dongguan 523808China

The recent observation of superconductivity in thin films of infinite-layer nickelate Nd_(0.8)Sr_(0.2)NiO_(2) has received considerable *** the many efforts to understand the superconductivity in infinite-layer nickelates,a consensus on the underlying mechanism for the superconductivity has yet to be reached,partly owing to the challenges with the material ***,we report the successful growth of superconducting infinite-layer Nd_(0.8)Sr_(0.2)NiO_(2) films by pulsed laser deposition and soft chemical *** details on the growth process are discussed.

关键词： synthesis reduction infinite

Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca2CuO2Cl2

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Chinese Physics Letters 2018年第6期35卷 84-89页

作者： Cheng Hu Jian-Fa Zhao Ying Ding Jing Liu Qiang Gao Lin Zhao Guo-Oong Liu Li Yu Chang-Qing Jin Chuang-Tian Chen Zu-Yan Xu xing-jiang zhou Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 10019 Collaborative Innovation Center of Quantum Matter Beijing 100871

The parent compounds of the high-temperature cuprate superconductors are Mott *** has been generally agreed that understanding the physics of the doped Mott insulators is essential to understanding the mechanism of high temperature superconductivity.A natural starting point is to elucidate the basic electronic structure of the parent *** we report comprehensive high resolution angle-resolved photoemission measurements on Ca_2CuO_2Cl_2,a Mott insulator and a prototypical parent compound of the *** *** Fermi surface sheets are revealed for the first *** high energy waterfall-like band dispersions exhibit different behaviors near the nodal and antinodal *** distinct energy scales are identified：a d-wave-like low energy peak dispersion and a nearly isotropic lower Hubbard band *** observations provide new information of the electronic structure of the cuprate parent compound,which is important for understanding the anomalous physical properties and superconductivity mechanism of the high temperature cuprate superconductors.

关键词： CuO Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca2CuO2Cl2 Ca Cl

Energizer keep going： 100 years of superconductivity

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Frontiers of physics 2011年第4期6卷 343-343页

作者： Pengcheng Dai (1) (2) xing-jiang zhou (2) Dao-xin Yao (3) 1. Department of Physics and Astronomy The University of Tennessee Knoxville USA2. National Laboratory for Superconductivity Institute of Physics CAS Beijing China3. School of Physics and Engineering Sun Yat-Sen University Guangzhou China

It has been 100 years since Heike Kamerlingh Onnes discovered superconductivity on April 8, 1911. Amazingly, this field is still very active and keeps booming, like a magic. A lot of new phenomena and materials have been found, and superconductors have been used in many different fields to improve our lives. Onnes won the Nobel Prize for this incredible discovery in 1913 and used the word superconductivity for the first time.

关键词： Energizer superconductivity quantum mechanics

Detailed electronic structure of three-dimensional Fermi surface and its sensitivity to charge density wave transition in ZrTe3 revealed by high resolution laser-based angle-resolved photoemission spectroscopy

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Chinese Physics B 2018年第8期27卷 535-542页

作者： Shou-Peng Lyu Li Yu Jian-Wei Huang Cheng-Tian Lin Qiang Gao Jing Liu Guo-Dong Liu Lin Zhao Jie Yuan Chuang-Tian Chen Zu-Yan Xu xing-jiang zhou National Laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences B eijing 100049China Max-Planck-Institut fiir Festki~rperforschung Heisenbergstrasse 170569 StuttgartGermany Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100871China

The detailed information of the electronic structure is the key to understanding the nature of charge density wave （CDW） order and its relationship with superconducting order in the microscopic level. In this paper, we present a high resolution laser-based angle-resolved photoemission spectroscopy （ARPES） study on the three-dimensional （3D） hole-like Fermi surface around the Brillouin zone center in a prototypical quasi-one-dimensional CDW and superconducting system ZrTe3. Double Fermi surface sheets are clearly resolved for the 3D hole-like Fermi surface around the zone center. The 3D Fermi surface shows a pronounced shrinking with increasing temperature. In particular, the quasiparticle scattering rate along the 3D Fermi surface experiences an anomaly near the charge density wave transition temperature of ZrTe3 - 63 K）. The signature of electron-phonon coupling is observed with a dispersion kink at -20 meV; the strength of the electron-phonon coupling around the 3D Fermi surface is rather weak. These results indicate that the 3D Fermi surface is also closely connected to the charge-density-wave transition and suggest a more global impact on the entire electronic structure induced by the CDW phase transition in ZrTe3.

关键词： angle-resolved photoemission spectroscopy ZrTe3, scattering rate electron-phonon coupling

Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy

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Chinese Physics Letters 2018年第1期35卷 90-94页

作者： Xuan Sun Wen-Tao Zhang Lin Zhao Guo-Dong Liu Gen-Da Gu Qin-Jun Peng Zhi-Min Wang Shen-Jin Zhang Feng Yang Chuang-Tian Chen Zu-Yan Xu xing-jiang zhou National Laboratory for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Bering 100049 Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNew York 11973USA Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190 Collaborative Innovation Center of Quantum Matter Beijing 100871

We carry out detailed momentum-dependent and temperature-dependent measurements on Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)(Bi2212)superconductor in the superconducting and pseudogap states by super-high resolution laser-based angleresolved photoemission *** precise determination of the superconducting gap for the nearly optimally doped Bi2212(T_(c)=91 K)at low temperature indicates that the momentum-dependence of the superconducting gap deviates from the standard d-wave form(cos(2Φ)).It can be alternatively fitted by including a high-order term(cos(6Φ))in which the next nearest-neighbor interaction is *** find that the band structure near the antinodal region smoothly evolves across the pseudogap temperature without a signature of band reorganization which is distinct from that found in Bi_(2)Sr_(2)CuO_(6+δ)*** indicates that the band reorganization across the pseudogap temperature is not a universal behavior in cuprate *** results provide new insights in understanding the nature of the superconducting gap and pseudogap in high-temperature cuprate superconductors.

关键词： Copper compounds

舰船尾流模拟气泡的脉冲激光后向散射特性研究

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光电子．激光 2007年第12期18卷 1508-1512页

作者：石晟玮蒋兴舟王江安石敏海军工程大学兵器工程系湖北武汉430033 海军工程大学电子工程学院湖北武汉430033 海军装备研究院北京100073

在Mie散射理论的基础上分析了尾流气泡的光散射特性,并用脉冲激光对尾流模拟气泡幕的后向散射光信号进行了实验研究,对气泡幕位置、接收发射轴夹角和多次散射等影响因素进行了详细讨论。实验发现:气泡幕存在条件下后向散射光信号得到明... 详细信息

在Mie散射理论的基础上分析了尾流气泡的光散射特性,并用脉冲激光对尾流模拟气泡幕的后向散射光信号进行了实验研究,对气泡幕位置、接收发射轴夹角和多次散射等影响因素进行了详细讨论。实验发现:气泡幕存在条件下后向散射光信号得到明显增强,且信号的峰值强度随气泡幕位置等参量的变化而改变:当气泡幕位置较近时,多次散射光信号将对接收信号产生明显的作用,是影响接收信号强度的一个重要因素。

关键词：气泡尾流 Mie散射后向散射多次散射

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平飞模式双站SAR成像算法研究

电子与信息学报 2007年第11期29卷 2702-2705页

作者：朱振波汤子跃蒋兴舟海军工程大学武汉430033 空军雷达学院武汉430019

双站SAR的成像技术是机载双站SAR的一个关键问题,该文首先建立了平飞模式的双站模型,然后在双站模型等效到单站的基础上,对双站SAR成像方法进行了研究,分别给出了平飞正侧视的CS双站成像算法和平飞斜侧视模式时的ECS双站成像算法,该等... 详细信息

双站SAR的成像技术是机载双站SAR的一个关键问题,该文首先建立了平飞模式的双站模型,然后在双站模型等效到单站的基础上,对双站SAR成像方法进行了研究,分别给出了平飞正侧视的CS双站成像算法和平飞斜侧视模式时的ECS双站成像算法,该等效方法能够解决平飞模式的双站SAR成像问题,最后通过计算机仿真,验证了该算法的有效性。

关键词：双站SAR ECS算法平飞

An efficient route to prepare suspended monolayer for feasible optical and electronic characterizations of two-dimensional materials

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InfoMat 2022年第2期4卷 126-138页

作者： Yuan Huang Yun-Kun Wang Xin-Yu Huang Guan-Hua Zhang Xu Han Yang Yang Yunan Gao Lei Meng Yushu Wang Guang-zhou Geng Li-Wei Liu Lin Zhao Zhi-Hai Cheng Xin-Feng Liu Ze-Feng Ren Hui-Xia Yang Yufeng Hao Hong-Jun Gao xing-jiang zhou Wei Ji Ye-Liang Wang Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina Songshan Lake Materials Laboratory DongguanChina State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijingChina Frontiers Science Center for Nanooptoelectronics&Collaborative Innovation Center of Quantum Matter BeijingChina State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanChina Minzu University of China BeijingChina National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina School of Information and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijingChina Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Renmin University of ChinaBeijingChina National Center for Nanoscience and Technology(NCNST)of China BeijingChina Haian Institute of New Technology Nanjing UniversityHaianChina University of Chinese Academy of Sciences BeijingChina

Two-dimensional(2D)materials are highly sensitive to substrates,interfaces,and the surrounding *** 2D materials are free from substrate-induced effects,thus an ideal approach to study their intrinsic ***,it is very challenging to prepare large-area suspended 2D materials with high *** we report a universal method,based on pretreatments of densely patterned hole array substrates with either oxygenplasma or gold film deposition,to prepare large-area suspended mono-and few-layer 2D *** structural,optical,and electrical characterization tools were used to fully evaluate the improved performance of various suspended 2D *** of these observations reported in this study are:(1)Observation of a new Raman low frequency mode for the suspended MoS_(2);(2)Significantly stronger photoluminescence(PL)and second harmonic generation(SHG)signals of suspended WSe_(2),which enables the study of new optical transition processes;(3)The low energy electron diffraction pattern on suspended MoS_(2) also exhibits much sharper spots than that on the supported area;and(4)The mobility of suspended graphene device approaches 300000 cm^(2) V^(-1) s^(-1),which is desirable to explore the intrinsic properties of *** work provides an innovative and efficient route for fabricating suspended 2D materials,and we expect that it can be broadly used for studying intrinsic properties of 2D materials and in applications of hybrid active nanophotonic and electronic devices.

关键词： mechanical exfoliation photoluminescence Raman spectrum suspended 2D materials