Constructing anisotropic single-dirac-cones in Bi 1-xSb x thin films

  • Tang S
  • Dresselhaus M
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Abstract

The electronic band structures of Bi${}_{1-x}$Sb${}_{x}$ thin films can be varied as a function of temperature, pressure, stoichiometry, film thickness and growth orientation. We here show how different anisotropic single-Dirac-cones can be constructed in a Bi${}_{1-x}$Sb${}_{x}$ thin film for different applications or research purposes. For predicting anisotropic single-Dirac-cones, we have developed an iterative-two-dimensional-two-band model to get a consistent inverse-effective-mass-tensor and band-gap, which can be used in a general two-dimensional system that has a non-parabolic dispersion relation as in a Bi${}_{1-x}$Sb${}_{x}$ thin film system.

Author-supplied keywords

  • Anisotropic
  • bismuth antimony
  • single-Dirac-cone
  • thin film

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Authors

  • Shuang Tang

  • Mildred S Dresselhaus

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