Microwave induced magnetoresistance oscillations at the subharmonics of the cyclotron resonance
S. I. Dorozhkin, J. H. Smet, K. von Klitzing, L. N. Pfeiffer, K. W. West
Abstract
The magnetoresistance oscillations, which occur in a two-dimensional electron system exposed to strong microwave radiation when the microwave frequency ω coincides with the n-th subharmonic of the cyclotron frequency ωc have been investigated for n = 2, 3 and 4. It is shown that these subharmonic features can be explained within a non-equilibrium energy distribution function picture without invoking multi-photon absorption processes. The existence of a frequency threshold above which such oscillations disappear lends further support to this explanation.
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