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Geometrical commensurability oscillations in the magnetoresistance of a two-dimensional electron gas under microwave irradiation

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Article number121306
<mark>Journal publication date</mark>15/09/2002
<mark>Journal</mark>Physical Review B
Issue number12
Number of pages4
Pages (from-to)-
<mark>Original language</mark>English


We report on 1/B-periodic magnetoresistance oscillations in a two-dimensional electron system induced by microwave irradiation. They are only present in high mobility samples when an initial light pulse has created a persistent photoconductive channel in the adjacent donor layer. The oscillations manifest a geometric commensurability between the electron cyclotron orbit and a steady-state periodic density modulation. The latter may originate from the non-linear dynamical screening of a surface acoustic wave potential in the persistent photoconductive channel, triggered by the incident monochromatic microwave.