Abstract
Quantum-beat spectroscopy is used to determine the exciton Zeeman splitting and Land\'e factor in narrow (30 \AA{}) and wide (120 \AA{}) 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 excition.
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