Anisotropic Dirac Fermions in a Bi Square Net of SrMnBi2

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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
Issue Date
2011-09
Language
English
Article Type
Article
Keywords

GRAPHENE; RESISTIVITY

Citation

PHYSICAL REVIEW LETTERS, v.107, no.12

ISSN
0031-9007
DOI
10.1103/PhysRevLett.107.126402
URI
http://hdl.handle.net/10203/212607
Appears in Collection
NT-Journal Papers(저널논문)
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