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Bulk Fermi surface of the layered superconductor TaSe_3 with three-dimensional strong topological state

机译：分层超导体酪蛋白表面与三维强拓扑状态的散装费米表面

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摘要

High-magnetic-field transport measurements and ab initio calculations on the layered superconductor TaSe_3 have provided evidence for the existence of a three-dimensional strong topological state. Longitudinal magne-totransport measurements up to ～33 T unveiled striking Shubnikov-de Haas oscillations with two fundamental frequencies at 100 and 175 T corresponding to a nontrivial hole Fermi pocket at the Γ point and a nontrivial electron Fermi pocket at the B point, respectively, in the Brillouin zone. However, calculations revealed one more electron pocket at the B point which was not detected by the magnetotransport measurements, presumably due to the limited carrier momentum relaxation lime. Angle-dependent quantum oscillations by rotating the sample with respect to the magnetic field revealed clear changes in the two fundamental frequencies, indicating anisotropic electronic Fermi pockets. The ab initio calculations gave the topological Z_2 invariant of (1; 100) and revealed a single Dirac cone on the (10 - 1) surface at the X-bar point with helical spin texture at a constant energy contour, suggesting a strong topological state. The results demonstrate TaSe.i as an excellent platform to study the interplay between the topological phase and superconductivity and a promising system for the exploration of topological superconductivity.
机译：层叠超导体Tase_3上的高磁场传输测量和AB Initio计算为存在三维强的拓扑状态提供了证据。纵向Magne-Totransport测量可在100和175t处具有两个基本频率的纵向〜33吨，分别对应于100和175t的两个基本频率，分别对应于γ点的非血管孔Fermi口袋，在布里渊区。然而，计算在B点处揭示了一个更多的电子口袋，该磁通量测量未检测到，可能是由于载体动量松弛石灰有限。通过相对于磁场旋转样品的角度依赖量子振荡显示出两个基本频率的透明变化，指示各向异性电子费米袋。 AB初始计算给出了（1; 100）的拓扑Z_2不变，并在X-Bar点处揭示了在X-Bar点的（10-1）表面上的单个DIAC锥，螺旋旋转纹理在恒定的能量轮廓上，表明了强大的拓扑状态。结果展示了淘汰赛作为研究拓扑相和超导之间相互作用的优秀平台以及拓扑超导性探索的有希望的系统。

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  • 来源
    《Physical review》 |2020年第15期|155117.1-155117.7|共7页
  • 作者

    Wei Xia; Xianbiao Shi; Yong Zhang; Hao Su; Qin Wang; Linchao Ding; Leiming Chen; Xia Wang; Zhiqiang Zou; Na Yu; Li Pi; Yufeng Hao; Bin Li; Zengwei Zhu; Weiwei Zhao; Xufeng Kou; Yanfeng Guo;

  • 作者单位

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center Harbin Institute of Technology Shenzhen 518055 China Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education Harbin Institute of Technology Harbin 150001 China;

    University of Chinese Academy of Sciences Beijing 100049 China School of Information Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China;

    College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China School of Physics and Microelectronics Zhengzhou University Zhengzhou Henan 450001 China;

    Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China;

    School of Materials Science and Engineering Henan Key Laboratory of Aeronautic Materials and Application Technology Zhengzhou University of Aeronautics Zhengzhou Henan 450046 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Analytical Instrumentation Center School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China;

    Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China;

    College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Haian Institute of New Technology Nanjing University Haian 226600 China;

    Information Research Center Nanjing University of Post and Telecommunication Nanjing 210023 China;

    Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China;

    State Key Laboratory of Advanced Welding & Joining and Flexible Printed Electronics Technology Center Harbin Institute of Technology Shenzhen 518055 China Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education Harbin Institute of Technology Harbin 150001 China;

    School of Information Science and Technology ShanghaiTech University Shanghai 201210 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China;

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