Energy spectrum and size quantization in partially ordered semiconductor alloys
M.E. Raikh and E.V. Tsiper
Department of Physics, University of Utah, Salt Lake City, Utah 84112
We present the analytical theory for the conduction-band spectrum in
partially ordered semiconductor alloys. It is assumed that the
ordering causes the coupling of the electronic states of &Gamma
minimum with the states of the closest-in-energy L minimum
only. We analyze the reduction of the band gap, change of the
effective mass, nonparabolicity, and anisotropy of the electronic
spectrum, caused by ordering. Using the spectrum obtained we study
the size quantization in an ordered domain sandwiched between two
disordered regions. We also calculate the electronic spectrum in the
region of interpenetration of two variants of ordering along the
[1,-1,1] and [1,1,-1] directions. The localization of an electron in
such a region is studied.