Pseudopotential band structure calculations of (GaAs)n - (AlAs)n with n = 1, 2, 3 and of Ga0.5Al0.5As show that the effects of cation order are small due to the weakness of the Ga-Al potential difference. The energy bands of the n = 1 heterostructure can be obtained by folding those of the alloy except for small energy shifts and splittings which can be handled in perturbation theory. The superlattice energy gap decreases with increasing n, the shrinkage being 4 meV for n = 2 and 10 meV for n = 3.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry