A high-quality, wide GaAs/AlAs quantum well has been characterized by photoluminescence excitation spectra using circularly polarized lights in a magnetic field up to 6T. The spectra show a well-resolved fine structure with a nonlinear dependence on magnetic field. The clear anticrossing observed in the spectra indicates exciton mixing due to the magnetic field. A detailed comparison of the experimental results with theoretical calculations, in which exciton mixing induced by the hybridized valence-band structure is taken into account, clarifies the origin of the observed peaks, and a strong interaction at the anticrossing is understood to be due to mixing between a 2s exciton state of the first heavy-hole subband and a 1s exciton state of the third heavy-hole subband. The high-resolution spectra of a selected anticrossing clearly indicate that a complicated many-exciton mixing model is essential to explain the excitation spectra of wide quantum wells.
|Number of pages||12|
|Publication status||Published - 1991 Jun|
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