Laser ARPES on Orbital Origin of Extremely Anisotropic Superconducting Gap in FeSe Superconductor

ORAL

Abstract

We have carried out high resolution laser-based angle-resolved photoemission (ARPES) measurements on bulk FeSe superconductor (Tc=8~9K). We will report direct observation of highly anisotropic Fermi surface and extremely anisotropic superconducting gap in the nematic state of the FeSe superconductor. We find that the low-energy excitations of the entire hole pocket at the Brillouin zone center are dominated by the single dxz orbital. The superconducting gap exhibits an anticorrelation relation with the dxz spectral weight near the Fermi level. These observations provide new insights in understanding the orbital origin of the extremely anisotropic superconducting gap in the FeSe superconductor and the relation between nematicity and superconductivity in the iron-based superconductors.

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Presenters

  • Cong Li

    Institute of Physics, Chinese Academy of Sciences

Authors

  • Cong Li

    Institute of Physics, Chinese Academy of Sciences

  • DeFa Liu

    Institute of Physics, Chinese Academy of Sciences

  • Jianwei Huang

    Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Sciences

  • Bin Lei

    Department of physics, University of Science and Technology of China

  • Le Wang

    Institute of Physics, Chinese Academy of Sciences, Institute of Physics

  • Xianxin Wu

    Institute for Theoretical Physics and Astrophysics, University of Wuerzburg, Physics, University of Wurzburg, Institute for Theoretical Physics and Astrophysics, Julius-Maximilians University of Wurzburg, Am Hubland, D-97074 Wurzburg, Germany, Institut für Theoretische Physik und Astrophysik, Julius-Maximilians-Universität Würzburg, Institute of Physics, Chinese Academy of Sciences, Univ of Wuerzburg, Institute for Theoretical Physics, University of Wuerzburg, Univ of Wurzburg

  • Qiang Gao

    Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Sciences, The Chinese Academy of Sciences, Institute of physics

  • Yuxiao Zhang

    Institute of Physics, Chinese Academy of Sciences

  • Xu Liu

    Institute of Physics, Chinese Academy of Sciences

  • Yong Hu

    Institute of Physics, Chinese Academy of Sciences

  • Lin Zhao

    National Laboratory for Superconductivity (NLSC), Institute of Physics, CAS, Institute of Physics, Chinese Academy of Sciences

  • Shaolong He

    Institute of Physics, Chinese Academy of Sciences

  • Guodong Liu

    Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Sciences, The Chinese Academy of Sciences, Institute of physics

  • Xiaoli Dong

    Institute of Physics, CAS, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, Institute of Physics, Chinese Academy of Sciences

  • Xiaowen Jia

    Institute of Physics, Chinese Academy of Sciences

  • Youguo Shi

    Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of Physics

  • Jiangping Hu

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, Institute of Physics, Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Tao Xiang

    Chinese Academy of Sciences (CAS), China, Institute of Physics, Institute of Physics, Chinese Academy of Sciences, Institute of Physics, CAS, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China

  • Xianhui Chen

    University of Science and Technology of China, Department of physics, University of Science and Technology of China

  • Zuyan Xu

    Technical Institue of Physics and Chemistry, Chinese Academy of Sciences

  • Chuangtian Chen

    Technical Institue of Physics and Chemistry, Chinese Academy of Sciences

  • Xingjiang Zhou

    Chinese Academy of Sciences (CAS), Institute of Physics, Chinese Academy of Sciences, National Laboratory for Superconductivity (NLSC), Institute of Physics, CAS, Chinese Academy of Sciences, The Chinese Academy of Sciences, Institute of physics