We develop a systematic theory of microwave-induced oscillations in magnetoresistivity of a 2D electron gas in the vicinity of fractional harmonics of the cyclotron resonance, observed in recent experiments. We show that in the limit of well-separated Landau levels the effect is dominated by the multiphoton inelastic mechanism. At moderate magnetic field, two single-photon mechanisms become important. One of them is due to resonant series of multiple single-photon transitions, while the other originates from microwave-induced sidebands in the density of states of disorder-broadened Landau levels.
@article{arxiv.0711.4249,
title = {Fractional microwave-induced resistance oscillations},
author = {I. A. Dmitriev and A. D. Mirlin and D. G. Polyakov},
journal= {arXiv preprint arXiv:0711.4249},
year = {2007}
}
Comments
3 pages, 2 figures; Proceedings of EP2DS17 to be published in Physica E; less technical version of arXiv:0707.0990