Crystal structure and electronic structure of non-centrosymmetrical trigonal PtBi<sub>2</sub>

ORAL

Abstract

Electronic structure of single crystalline γ-PtBi2 is studied by angle-resolved photoemission spectroscopy(ARPES). It is proposed by theoretical calculation that the stable structure of γ-PtBi2 should be non-centrosymmetric. ARPES measurement gives powerful evidences in this paper that different band structures between two types of cleaved surface are clearly observed. Bulk and surface bands are characterized through systematically photon dependent measurement. The bulk band dispersions agree well with the first-principle calculation except Rashba shaped surface states. The topography studied by STM also confirms the existence of two different cleaved surfaces. Besides, some efforts has been made to demonstrate the existence of triply degenerate point fermions.

*This work is supported by National Basic Research Program of China (Grants No.2012CB927401, No.2013CB921902), National Natural Science Foundation of China (Grants No. 11574201, No11521404, No 11134008, No. 11174199, No.11374206, No. 11274228., No 11227404, No. 91421312, and No. 91221302), Shanghai Committee of Science and Technology (No. 12JC140530). D.Q. achknowledges support from the Changjiang Scholars Program and the Program for Professor of Special Appointment (East Scholar).

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Presenters

  • Wenxiang Jiang

    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

Authors

  • Wenxiang Jiang

    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Fengfeng Zhu

    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Ping Li

    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Haiyang Ma

    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Haohua Sun

    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Zhongqiang Yang

    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Canhua Liu

    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Dandan Guan

    • Shanghai Jiaotong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Jinfeng Jia

    • shanghai jiao tong university
    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Weidong Luo

    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University

  • Dong Qian

    • Shanghai Jiao Tong University
    • Department of Physics and Astronomy, Shanghai Jiao Tong University