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- Lee, Geunsik
- Computational Research on Electronic Structure and Transport in Condensed Materials
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Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2
- Alternative Title
- Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2
- Author(s)
- Park, Joonbum, Lee, Geunsik, Wolff-Fabris, F., Koh, Y.Y., Eom,M.J., Kim, Y.K., Farhan, M.A., Jo, Y.J., Kim, C., Shim, J.H., Kim, J.S.
- Issued Date
- 2011-09
- Citation
- PHYSICAL REVIEW LETTERS, v.107, no.12, pp.126402
- 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.
- Publisher
- AMER PHYSICAL SOC
- ISSN
- 0031-9007
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