Electronic Structure of Topological Material CaMnSb<sub>2</sub>

ORAL

Abstract


AMnPn2 (A = Ca, Sr, Ba, Eu, Yb; Pn = Sb, Bi) compounds are new kind of topological materials. Theoretical studies indicate that AMnPn2 host an anisotropic Dirac cone near the Fermi surface. Here we report our high-resolution laser-based angle-resolved photoemission measurements on the electronic structure of CaMnSb2. The Fermi surface of CaMnSb2 mainly consists of one hole pocket around the Brillouin zone center and two tiny hole pockets at the Brillouin zone boundary which are consistent with the first principle calculations. In addition, we observe four additional points located at the hole pocket around the Brillouin zone center along the high symmetry directions which is hard to be accounted for by band structure calculations.

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Presenters

  • Hongtao Rong

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

Authors

  • Hongtao Rong

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

  • Junbao He

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

  • Yongqing Cai

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

  • Guodong Liu

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

  • Lin Zhao

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

  • Zuyan Xu

    • Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190 , China
    • Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

  • Xingjiang Zhou

    • Beijing National Laboratory for Condensed Matter Physics, Insititute of Physics, Chinese Academy of Science
    • Institute of Physics, Chinese Academy of Science,Beijing 100190, China
    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences