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Diamagnetic shift and oscillator strength of two-dimensional excitons under a magnetic field in In0.53Ga0.47As/InP quantum wells.

We studied magneto-optical absorption spectra of the ground-state electron-heavy-hole exciton resonance in In 0.53 Ga 0.47 As/InP quantum wells. As the magnetic field perpendicular to the quantum-well layers was increased, the exciton resonance showed diamagnetic shifts and its integrated intensity increased. Magneto-optical data were analyzed using effective-mass equations which include conduction- and valence-subband nonparabolic dispersion and the wave-vector dependent transition-matrix element with the second-order k.p terms. We found that the exciton wave function for the relative in-plane motion shrinks in real space and expands in k space due to the in-plane parabolic confinement potential by the magnetic fields. This enhanced the integrated intensity and thus, the oscillator strength