Abstract
We present a generalized perturbation method that is applicable for atomic-scale superlattices. The present model is in good quantitative agreement with full band theories with local-density approximation, and approaches results of the conventional perturbation method (i.e., Kane’s Hamiltonian) with the envelope function approximation for superlattices with large periods. The indirect band gap of AlAs/GaAs superlattices with short periods observed in experiments is explained using this method.
- Received 6 March 1997
DOI:https://doi.org/10.1103/PhysRevB.56.3933
©1997 American Physical Society