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11 May 1994 Study of the mechanism of the heavy- and light-hole mixing in GaAs/AlAs superlattices by the exciton magnetoluminescence
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Proceedings Volume 2139, Quantum Well and Superlattice Physics V; (1994) https://doi.org/10.1117/12.175729
Event: OE/LASE '94, 1994, Los Angeles, CA, United States
Abstract
We present a theory for the exciton magnetoluminescence in GaAs/AlAs superlattices. We have found the energies of the exciton states, taking into account an additional exchange splitting, which has been found experimentally. This splitting is attributed to the symmetry reduction from D2d to C2v, and it should lead to the polarized luminescence under the appropriately polarized excitation. Instead, a non-polarized luminescence was observed. At present, there are two alternative models explaining this phenomena. We have calculated the effect of the magnetic field on the exciton levels splitting in GaAs/AlAs superlattices and demonstrated that the two models give very different results for the hole g-factor. We show that measurements of the luminescence polarization allow us to choose between the alternative models of this splitting. The exciton luminescence, while completely non-polarized at zero magnetic field, becomes partially polarized at some specific values of the magnetic field. At these points, a level crossing occurs and one of the splittings in the exciton multiplet becomes zero. We show that these values of the magnetic field are very different in the two models of the additional exchange splitting.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. E. Pikus and F. G. Pikus "Study of the mechanism of the heavy- and light-hole mixing in GaAs/AlAs superlattices by the exciton magnetoluminescence", Proc. SPIE 2139, Quantum Well and Superlattice Physics V, (11 May 1994); https://doi.org/10.1117/12.175729
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