Abstract
We have developed an eight-band finite-difference envelope functionapproximation model capable of reproducing in almost all situations the true D2d orC2vsymmetry of [001] grown zinc-blende heterostructures. We have used our model tostudy the relative contributions of the bulk inversion asymmetry (BIA) andstructural inversion asymmetry to the spin splitting in the conduction band ofasymmetric AlSb/GaSb/InAs/AlSb quantum wells, and clarify apparentlycontradictory statements about the relative magnitude of the two contributions.We show that, in the system under study, the inclusion of BIA effects changesconsiderably the angular dependence and the magnitude of the splitting. We alsoinvestigate how BIA changes the transmission properties of a resonant tunnellingstructure.
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