Anisotropic Dirac fermions in a Bi square net of SrMnBi2

Details Anisotropic Dirac fermions in a Bi square net of SrMnBi2 Anisotropic Dirac fermions in a Bi square net of SrMnBi2

2011-04-27

arxiv.org/abs/1104.5138v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

We report the highly anisotropic Dirac fermions in a Bi square net of SrMnBi2, based on a first principle 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 ~ 8. These findings demonstrate that a Bi square net, a common building block of various layered pnictides, provide a new platform that hosts highly anisotropic Dirac fermions.

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