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Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn_(3)

         

摘要

Signatures of topological superconductivity(TSC)in superconducting materials with topological nontrivial states prompt intensive researches recently.Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations,we demonstrate multiple Dirac fermions and surface states in superconductor BaSn_(3) with a critical transition temperature of about 4.4 K.We predict and then unveil the existence of two pairs of type-Ⅰtopological Dirac fermions residing on the rotational axis.Type-ⅡDirac fermions protected by screw axis are confirmed in the same compound.Further calculation for the spin helical texture of the observed surface states originating from the Dirac fermions gives an opportunity for realization of TSC in one single material.Hosting multiple Dirac fermions and topological surface states,the intrinsic superconductor BaSn_(3) is expected to be a new platform for further investigation of topological quantum materials as well as TSC.

著录项

  • 来源
    《中国物理快报:英文版》 |2021年第10期|43-48|共6页
  • 作者单位

    Center for Excellence in Superconducting Electronics;

    State Key Laboratory of Functional Materials for Informatics;

    Shanghai Institute of Microsystem and Information Technology;

    Chinese Academy of Sciences;

    Shanghai 200050;

    China;

    Center of Materials Science and Optoelectronics Engineering;

    University of Chinese Academy of Sciences;

    Beijing 100049;

    China;

    School of Physical Science and Technology;

    Shanghai Tech University;

    University;

    Shanghai 201210;

    State Key Laboratory of Advanced Welding and Joining;

    Harbin Institute of Technology;

    Shenzhen 518055;

    China;

    Flexible Printed Electronics Technology Center;

    Harbin Institute of Technology;

    Shenzhen 518055;

    China;

    Shanghai Tech Laboratory for Topological Physics;

    Shanghai Tech University;

    Shanghai 201210;

    China;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 超导体、超导体材料;
  • 关键词

    material; topological; Dirac;

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