Topological Dirac Semimetal BaAuSb

ORAL

Abstract

Dirac semimetals feature Dirac cones with topologically non-trivial states in the bulk that are protected by crystalline symmetries. They attract considerable attention due to rich quantum states and properties of interest, such as high Fermi velocities, mobility and small effective masses. In my talk I will show that ternary intermetallic BaAuSb crystal hosts both trivial and non-trivial topological Dirac states in the bulk. The non-trivial Fermi surface pocket at the Brillouin zone center is characterized with only few hundredths of the bare electron mass and with very high mobility. All parts of Fermi surface detected by quantum oscillations, topologically trivial or non-trivial have carriers with unusually high Fermi velocities and small masses.

*Work at Brookhaven National Laboratory was supported by US DOE, Office of Science, Office of Basic Energy Sciences under contract DE-SC0012704. Work at Renmin University was funded by the research Funds of Renmin University of China (RUC) (Grant Nos. 15XNLQ07, 18XNLG14, and 19XNLG17). A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR1644779 and the State of Florida. B.Y. acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Consolidator Grant 'Nonlinear Topo', No. 815869). J.Z.M. was supported by the National Natural Science Foundation of China (12104379), Guangdong Basic and Applied Basic Research Foundation (2021B1515130007). Y. Hu and M. S. acknowledge the support from NCCR-MARVEL funded by Swiss National Science Foundation.

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Presenters

  • Zhixiang Hu

    • Brookhaven National Laboratory
    • Stony Brook University (SUNY)

Authors

  • Zhixiang Hu

    • Brookhaven National Laboratory
    • Stony Brook University (SUNY)