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

  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},
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… 

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