Microwave induced magnetoresistance oscillations at the subharmonics of the cyclotron resonance
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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