We demonstrate an asymmetric dependence of the spin-flip electronic Raman spectrum from a two-dimensional electron gas on the direction of circular polarization of the photons, resulting from an interference of light scattered from longitudinal and transverse spin-density fluctuations. By exploiting these selection rules, we are able to determine experimentally that the sign of the band-structure parameter a₄₂, which describes the bulk k³ conduction-band spin splitting in zinc-blende semiconductors, is negative for GaAs.
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Richards et al. (1999) studied this question.
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