Anisotropic Dirac fermions in a Bi square net of SrMnBi2 |
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Authors: | Park Joonbum Lee G 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 |
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Affiliation: | Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea. |
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Abstract: | We report the observation of highly anisotropic Dirac fermions in a Bi square net of SrMnBi(2), 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 SrMnBi(2) is highly anisotropic with a large momentum-dependent disparity of Fermi velocities of ~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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