We have studied the spin splitting of Landau levels for a two-dimensional electron gas in an InAs/GaSb single quantum well. The effective g factor, g*, is between 7.8 and 8.7 which is below the bulk value. The reduction in g* is due to nonparabolicity effects resulting from confinement of free electrons to a narrow quantum well. Under these circumstances g* enhancement due to many-body effects is smaller than the reduction due to nonparabolicity.
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Smith et al. (1987) studied this question.
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