Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2

Title
Anisotropic Dirac Fermions in BaMnBi2 and BaZnBi2
Authors
류혜진Se young ParkLijun LiWeijun RenJeff B. NeatonCedomir PetrovicChoongyu HwangSung-Kwan Mo
Issue Date
2018-10
Publisher
Scientific Reports
Citation
VOL 8-15322-7
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.
URI
http://pubs.kist.re.kr/handle/201004/70267
ISSN
2045-2322
Appears in Collections:
KIST Publication > Article
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