Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2. Issue 1 (December 2018)

• Record Type: Journal Article
• Authors: Ryu, Hyejin; Park, Se; Li, Lijun; Ren, Weijun; Neaton, Jeffrey; Petrovic, Cedomir; Hwang, Choongyu; Mo, Sung-Kwan
• Is Part Of: Scientific reports. Volume 8:Issue 1(2018)
• Page Start: 1
• Page End: 7
• Publication Date: 2018-12
• Subjects: Natural history -- Research -- Periodicals; Biology -- Research -- Periodicals; Physical sciences -- Research -- Periodicals; Earth sciences -- Research -- Periodicals; Environmental sciences -- Research -- Periodicals; 502.85
• DOI: 10.1038/s41598-018-33512-w
• Languages: English
• ISSNs: 2045-2322

Abstract

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.