Anisotropic Dirac Fermions in BaMnBi$_{2}$ and BaZnBi$_{2}$

ORAL

Abstract

We report electronic structures of BaMnBi$_{2}$ and BaZnBi$_{2}$ sharing similar structural properties but having different valence configuration of the Mn/Zn-Bi complex. Our angle-resolved photoemission measurements found a strong anisotropic Dirac dispersion in BaMnBi$_{2}$ and a complete departure from the Dirac dispersion in BaZnBi$_{2}$. Our findings, substantiated by the first principle calculations, allow us to understand role of Mn/Zn-Bi tetrahedra in the changes of the electronic structures as well as the effect of varying band filling of Bi-square net.

*Work at BNL was supported by the U.S. Dept of Energy-BES, Division of Materials Science and Engineering, under Contract No. DE-SC0012704 and Chinese Academy of Sciences under Grant No. KJZD-EW-M05

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Authors

  • Hyejin Ryu

    • ALS, Lawrence Berkeley National Lab., Berkeley, CA 94720, US. Max Plank POSTECH Center for Complex Phase Materials, POSTECH, Korea.

  • Se Young Park

    • Dept. of Phys. & Astro, Rutgers U., Piscataway, NJ 08854, US.

  • Lijun Li

    • Condensed Matt. Phys. and Materials Science Dept, Brookhaven National Lab., Upton, NY 11973, US

  • Weijun Ren

    • CMPMSD, Brookhaven National Lab., Upton, NY 11973, US and Shenyang National Lab. for Materials Science, Inst. of Metal Research, CAS, China.

  • Cedomir Petrovic

    • CMPMSD, Brookhaven National Lab., Upton, NY 11973, US

  • Choonkyu Hwang

    • Dept. of Phys., Pusan National U., Busan 609-735, Korea. Max Plank POSTECH Center for Complex Phase Materials, POSTECH, Korea.

  • Sung-Kwan Mo

    • ALS, Lawrence Berkeley National Lab., Berkeley, CA 94720, US