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Quantum-beat spectroscopy of the Zeeman splitting of heavy- and light-hole excitons in GaAs/AlxGa1-xAs quantum wells.

Quantum-beat spectroscopy is used to determine the exciton Zeeman splitting and Lande factor in narrow (30 A) and wide (120 A) GaAs quantum wells. We find that while the heavy-hole splitting decreases with well width, the light hole exhibits an opposite trend. Measurements of higher magneto-excitons of the wide well show significant increase in the Zeeman splitting with respect to the lowest heavy-hole exciton