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Anisotropic Dirac electronic structures of AMnBi2 (A=Sr,Ca)

Title
Anisotropic Dirac electronic structures of AMnBi2 (A=Sr,Ca)
Authors
Geunsik LeeMuhammad A. FarhanKim, JSShim, JH
POSTECH Authors
Kim, JSShim, JH
Date Issued
Jun-2013
Publisher
2013 American Physical Society
Abstract
Low-energy electronic structures in AMnBi(2) (A=alkaline earths) are investigated using a first-principles calculation and a tight binding method. An anisotropic Dirac dispersion is induced by the checkerboard arrangement of A atoms above and below the Bi square net in AMnBi(2 center dot) SrMnBi2 and CaMnBi2 have a different kind of Dirac dispersion due to the different stacking of nearby A layers, where each Sr (Ca) of one side appears at the coincident (staggered) xy position of the same element at the other side. Using the tight binding analysis, we reveal the chirality of the anisotropic Dirac electrons as well as the sizable spin-orbit coupling effect in the Bi square net. We suggest that the Bi square net provides a platform for the interplay between anisotropic Dirac electrons and the neighboring environment such as magnetism and structural changes.
Keywords
HGTE QUANTUM-WELLS; TRANSITION; GRAPHENE; PHASE
URI
http://oasis.postech.ac.kr/handle/2014.oak/15482
DOI
10.1103/PHYSREVB.87.245104
ISSN
1098-0121
Article Type
Article
Citation
PHYSICAL REVIEW B, vol. 87, no. 24, page. 245104-1 - 245104-10, 2013-06
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 SHIM, JI HOON
Dept of Chemistry
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