Analytical bond orbital model: Heterobond effect on optical properties of InAs/GaSb superlattices

Abstract

This paper develops an efficient bond orbital model with analytical expressions to investigate the optical properties of InAsGaSb superlattices. In contrast to the conventional bond orbital model, the proposed method expresses the momentum matrix elements entirely in terms of Hamiltonian matrix elements without introducing any additional optical parameters. The existence of In-Sb and Ga-As heterobonds across the InAsGaSb superlattice interfaces causes giant optical variations to be manifested in the momentum matrix element, absorption coefficient, and refractive index. © 2005 American Institute of Physics.