Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2
- Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2
- 류혜진; Se young Park; Lijun Li; Weijun Ren; Jeff B. Neaton; Cedomir Petrovic; Choongyu Hwang; Sung-Kwan Mo
- Issue Date
- Scientific Reports
- VOL 8-15322-7
- 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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