Cyclotron resonance harmonics in the ac response of a 2D electron gas with smooth disorder

I. A. Dmitriev, A. D. Mirlin, D. G. Polyakov

Published 2003-04-23, updated 2003-10-28Version 2

The frequency-dependent conductivity $\sigma_{xx}(\omega)$ of 2D electrons subjected to a transverse magnetic field and smooth disorder is calculated. The interplay of Landau quantization and disorder scattering gives rise to an oscillatory structure that survives in the high-temperature limit. The relation to recent experiments on photoconductivity by Zudov {\it et al.} and Mani {\it et al.} is discussed.