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Condensed Matter Seminars
| Condensed Matter
Monday, January 26, 2004
Physics Building, Room 204
Note special date.
Note special time.
Note special room.
[Host: Paul Fendley]
"Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas"
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. Oscillations grow with radiation intensity, with the
minima saturating at zero resistance. We have performed a
diagrammatic calculation which yields radiation-induced
resistivity oscillations with the correct period and phase.
Results are understood via a simple picture of photoexcited
disorder-scattered electrons contributing to the dc
conductivity. Sufficient intensity drives the calculated minima
to negative resistivity, a situation shown by Andreev, Aleiner,
and Millis to be unstable to the development of an inhomogeneous
current distribution with zero resistivity. Hence, our result,
taken together with theirs, provides an explanation for the
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