The first room-temperature two-dimensional heavy hole exciton red shift, greater than 25 meV due to the exchange of Van Hove-type M1 and quantum well excitons, was observed by photocurrent measurements in molecular beam epitaxy grown superlattices with periods of 30 Å GaAs/25 Å Ga0.5Al0.5As. At a photon energy of 1.66 eV, a 3000 cm−1 absorption change due to the blue shift of the superlattice absorption edge was also observed at room temperature in superlattices with periods of 20 Å GaAs/20 Å Ga0.5Al0.5As.
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Yan et al. (1989) studied this question.