Abstract
Experimental and theoretical results on the high frequency magnetoconductivity in the twodimensional electron gas formed at semiconductor-insulator interfaces are reviewed. The discussion is centered around cyclotron resonance (CR) in electron inversion layers on semiconductors with a parabolic conduction band, mainly Si. Space charge layers on semiconductors with nearly degenerate bands, where the surface electric field influences the band mixing, are a second topic. There the dependence of the surface CR mass on carrier density can be explained by subband non-parabolicity. In addition many of these systems are well suited to study effects related to occupation of several subbands.
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