• DOI:10.1103/PhysRevB.87.245104
• Corpus ID: 118681405

Anisotropic Dirac electronic structures of A MnBi 2 ( A = Sr ,Ca)

@article{Lee2013AnisotropicDE,
  title={Anisotropic Dirac electronic structures of A MnBi 2 ( A = Sr ,Ca)},
  author={Geunsik Lee and Muhammad A. Farhan and Jun Sung Kim and Ji Hoon Shim},
  journal={Physical Review B},
  year={2013},
  volume={87},
  pages={245104}
}

• Geunsik Lee, M. Farhan, +1 author J. Shim
• Published 7 January 2013
• Physics
• Physical Review B

Low-energy electronic structures in $A$MnBi${}_{2}$ ($A$=alkaline earths) are investigated using a first-principles calculation and a tight binding method. An anisotropic Dirac dispersion is induced by the checkerboard arrangement of $A$ atoms above and below the Bi square net in $A$MnBi${}_{2}$. SrMnBi${}_{2}$ and CaMnBi${}_{2}$ have a different kind of Dirac dispersion due to the different stacking of nearby $A$ layers, where each Sr (Ca) of one side appears at the coincident (staggered) $xy$ position of the same element at the other side. Using the tight binding analysis, we reveal the chirality of the anisotropic Dirac electrons as well as the sizable spin-orbit coupling effect in the Bi square net. We suggest that the Bi square net provides a platform for the interplay between anisotropic Dirac electrons and the neighboring environment such as magnetism and structural changes.