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Band Mixing Effects in Quantum Well Magnetoexcitons

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Wysocki R., Bardyszewski W., Schoser S., Potemski M.
Acta Physica Polonica A
|
1997
|
vol. 92
|
issue 5
1067-1071
EN
The influence of intersubband mixing in quantum wells of semiconductors with zinc-blende structure is studied both experimentally and theoretically. A multiband magnetoexciton model is described which takes into account k∙p mixing between valence subbands and the effective Coulomb interaction for an arbitrary confinement potential shape. Theoretical results reproduce very well the photoluminescence excitation spectra of GaAs/AlGaAs single quantum wells of various widths. In particular, the characteristic avoided crossing between the lowest light-hole exciton Landau level and excited heavy-hole exciton Landau level occurring at σ¯ polarization is accurately described by our theory.
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