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Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2.

  • Author(s): Ryu, Hyejin;
  • Park, Se Young;
  • Li, Lijun;
  • Ren, Weijun;
  • Neaton, Jeffrey B;
  • Petrovic, Cedomir;
  • Hwang, Choongyu;
  • Mo, Sung-Kwan
  • et al.
Abstract

We investigate the electronic structure of BaMnBi2 and BaZnBi2 using angle-resolved photoemission spectroscopy and first-principles calculations. Although they share similar structural properties, we show that their electronic structure exhibit dramatic differences. A strong anisotropic Dirac dispersion is revealed in BaMnBi2 with a decreased asymmetry factor compared with other members of AMnBi2 (A = alkali earth or rare earth elements) family. In addition to the Dirac cones, multiple bands crossing the Fermi energy give rise to a complex Fermi surface topology for BaZnBi2. We further show that the strength of hybridization between Bi-p and Mn-d/Zn-s states is the main driver of the differences in electronic structure for these two related compounds.

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