Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas

Details Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas

2003-01-29

arxiv.org/abs/cond-mat/0301569v3

Phys. Rev. Lett. 91, 086803 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; final version as published in Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.91.086803

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.

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