Chemical Bonding Induced Topological Lifshitz Transition in Type-II Dirac Semimetal VAl<sub>3</sub>

ORAL

Abstract

We report a chemical bonding induced Lifshitz transition of Ti1-xVxAl3 in which the compounds evolve from p-type trivial metal to n-type robust Dirac semimetal. This topological transition is concomitant with an anomalous structural distortion which stems from the interplanar V-Al bond formation. The V-Al bonds in Ti1-xVxAl3 are built up as long as the bonding orbitals of V atoms are fully populated by the electrons. In other words, the type-II Dirac semimetal state of VAl3 is protected by the V-Al bonds whose molecular orbitals are the “gravity center” of the topological electron and hole bands.

*This work was supported by the National Natural Science Foundation of China No.11774007 and No. U1832214, the National Key R&D Program of China (2018YFA0305601) and the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDB28000000. T.-R.C. were supported by the Ministry of Science and Technology under MOST Young Scholar Fellowship: the MOST Grant for the Columbus Program NO. 107-2636-M-006-004-, National Cheng Kung University, Taiwan, and National Center for Theoretical Sciences (NCTS), Taiwan.

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Presenters

  • Shuang Jia

    • International Center for Quantum Materials, Peking University
    • Peking University, China
    • Physics, Peking University
    • Peking University
    • International Center for Quantum Materials, School of Physics, Peking University

Authors

  • Yi-Yuan Liu

    • Physics, Peking University

  • Yu-Fei Liu

    • Physics, Peking University

  • Xin Gui

    • Chemistry, Louisiana State University
    • Louisiana State University
    • Department of Chemistry, Louisiana State University
    • Chemistry, Louisiana State Univeristy

  • Cheng Xiang

    • Physics, Peking University

  • Huibing Zhou

    • Physics, Peking University
    • International Center for Quantum Materials, Peking University

  • Weiwei Xie

    • Chemistry, Louisiana State University
    • Louisiana State University
    • Department of Chemistry, Louisiana State University
    • Chemistry, Louisiana State Univeristy

  • Chuang-Han Hsu

    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • National University of Singapore
    • Physics, National University of Singapore

  • Hsin Lin

    • Academia Sinica
    • Institute of Physics, Academia Sinica
    • Physics, Academia Sinica, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
    • Physics, Academia Sinica
    • Department of Physics, National University of Singapore
    • National University of Singapore
    • Academia Sinica, Taipei, Taiwan

  • Tay-Rong Chang

    • National Cheng Kung University
    • Physics, National Cheng Chung University
    • Physics, National Cheng Kung University, Tainan, 701, Taiwan
    • Department of Physics, National Cheng Kung University
    • Physics, National Tsing Hua University
    • Physics, National Cheng Kung University

  • Shuang Jia

    • International Center for Quantum Materials, Peking University
    • Peking University, China
    • Physics, Peking University
    • Peking University
    • International Center for Quantum Materials, School of Physics, Peking University