Anisotropic Dirac fermions in a Bi square net of SrMnBi2
SCIE
SCOPUS
- Title
- Anisotropic Dirac fermions in a Bi square net of SrMnBi2
- Authors
- Park, J; Lee, G; Wolff-Fabris, F; Koh, YY; Eom, MJ; Kim, YK; Farhan, MA; Jo, YJ; Kim, C; Shim, JH; Kim, JS
- Date Issued
- 2011-09-16
- Publisher
- American Physical Society
- Abstract
- We report the observation of highly anisotropic Dirac fermions in a Bi square net of SrMnBi2, based on a first-principles calculation, angle-resolved photoemission spectroscopy, and quantum oscillations for high-quality single crystals. We found that the Dirac dispersion is generally induced in the (SrBi)(+) layer containing a double-sized Bi square net. In contrast to the commonly observed isotropic Dirac cone, the Dirac cone in SrMnBi2 is highly anisotropic with a large momentum-dependent disparity of Fermi velocities of similar to 8. These findings demonstrate that a Bi square net, a common building block of various layered pnictides, provides a new platform that hosts highly anisotropic Dirac fermions.
- Keywords
- GRAPHENE; RESISTIVITY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16975
- DOI
- 10.1103/PHYSREVLETT.107.126402
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- Physical Review Letters, vol. 107, no. 12, page. 126402-1 - 126402-5, 2011-09-16
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