Recent measurements of a 2D electron gas subjected to microwave radiation reveal a magnetoresistance with an oscillatory dependence on the ratio of radiation frequency to cyclotron frequency. We perform a diagrammatic calculation and find radiation-induced resistivity oscillations with the correct period and phase. Results are explained via a simple picture of current induced by photo-excited disorder-scattered electrons. The oscillations increase with radiation intensity, easily exceeding the dark resistivity and resulting in negative-resistivity minima. At high intensity, we identify additional features, likely due to multi-photon processes, which have yet to be observed experimentally.
@article{arxiv.cond-mat/0301569,
title = {Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas},
author = {Adam C. Durst and Subir Sachdev and N. Read and S. M. Girvin},
journal= {arXiv preprint arXiv:cond-mat/0301569},
year = {2009}
}
Comments
5 pages, 3 figures; final version as published in Phys Rev Lett