Abstract
A large exchange enhancement of the spin-splitting of a two-dimensional electron gas in GaAs has been determined from optical spectroscopy. When the Fermi energy is located between the spin-split electron states (\ensuremath{\nu}=1), we observe a striking temperature dependence in the optical absorption of interband transitions associated with both spin levels. The absorption intensity of the transitions monitors the occupations of the spin-split levels. Analysis of the temperature dependence reveals an exchange enhancement of the electron g factor of \ensuremath{\approxeq}9. .AE
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