Effect of valence-band hybridization on the exciton spectra in GaAs-As quantum wells
- 15 November 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (15), 8102-8108
- https://doi.org/10.1103/physrevb.36.8102
Abstract
An investigation is made into the effect of valence-band coupling on Wannier excitons in GaAs- As quantum wells with well widths ranging from 30 to 200 Å. The results of our calculation show that the effect is twofold. On the one hand, hole-subband nonparabolicity due to mixing of the heavy- (HH) and light-hole (LH) states causes an increase in the binding energies , of both ground- and excited-state excitons; on the other hand, the different orbital behaviors of the spinor components of the excitonic wave function result in a decreased of s-state excitons and an increased of p- and d-state excitons. The former effect dominates in narrower wells and the latter effect dominates in wider wells. The two-band model is a good approximation for calculating (HH1), but can cause a significant error in calculating (LH1) in wider wells because of the stronger coupling between exciton states from different subbands.
Keywords
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