Abstract
We discuss the far-infrared absorption in quantum wells in the presence of a quantizing magnetic field. Our theory is applicable both to electrons and holes. Band structure effects are fully taken into account and our approach allows us to consider different sample geometries and potential profiles. As an example we discuss the spin-split cyclotron resonance in the non-parabolic 2D electron gas in InAs AlSb quantum wells. Our parameter-free calculations are in excellent agreement with recent experiments. The complex valence band structure results in anticrossings between Landau levels of different hole subbands.
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