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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2

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Title
Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2
Other Titles
Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2
Author
Park, JoonbumLee, GeunsikWolff-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.
Keywords
GRAPHENE; RESISTIVITY
Issue Date
2011-09
Publisher
AMER PHYSICAL SOC
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.
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DOI
10.1103/PhysRevLett.107.126402
ISSN
0031-9007
Appears in Collections:
PHY_Journal Papers
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