Approximate bandstructures of semiconductor alloys from tight-binding supercell calculations

  title={Approximate bandstructures of semiconductor alloys from tight-binding supercell calculations},
  author={Timothy B. Boykin and Neerav Kharche and Gerhard Klimeck and Marek Korkusinski},
Alloys such as AlGaAs, InGaAs, and SiGe find widespread usage in nanoelectronic devices such as quantum dots and nanowires. For these devices, in which the carriers probe nanometre-scale local disorder, the commonly employed virtual crystal approximation (VCA) is inadequate. Although the VCA produces small-cell E(k) relations it fails to include local disorder. In contrast, random-alloy supercell calculations do include local disorder but only deliver band extrema and supercell (not small cell… CONTINUE READING
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