Localized Quantum Well Excitons in the High Magnetic Field Limit.

We have studied the optical properties of the quasi-two-dimensional ground state exciton in GaAs-AlGaAs quantum wells in transverse magnetic fields for which the cyclotron energy is comparable to the zero-field excitonic binding energy. Low temperature effects on exciton localization, oscillator strength and binding energy are revealed by luminescence excitation and resonant Raman spectroscopy.