Cyclotron-resonance optical absorption in corrugated lateral superlattices

The cyclotron-resonance (CR) optical absorptions of GaAs/AlAs corrugated la teral superlattices (CLS's) in vertically applied magnetic fields are inves tigated. A peak splitting in the absorption spectra and large deviations of the CR absorption frequency from the value in unmodulated two-dimensional systems are predicted, as a result of the cyclotron-resonance-intersubband coupling in the CLS. A continuous peak narrowing in the CR absorption spect ra is found as the magnetic field increases, which can be explained by the formation of the electron Landau bands due to the lateral modulation by the corrugated interfaces of the CLS's.