Photo-current and photo-voltage oscillations in the two-dimensional electron system: screening and "anti-screening" of a potential profile

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Dorozhkin, S. I.
Pechenezhskiy, I. V.
Pfeiffer, L. N.
West, K. W.
Umansky, V.
von Klitzing, K.
Smet, J. H.
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Abstract
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We observe in state-of-the-art GaAs based 2D electron systems microwave induced photo-current and photo-voltage oscillations around zero as a function of the applied magnetic field. The photo-signals pass zero whenever the microwave frequency is close to a multiple of the cyclotron resonance frequency. They originate from built-in electric fields due to for instance band bending at contacts. The oscillations correspond to a suppression (screening) or an enhancement ("anti-screening") of these fields by the photo-excited electrons.
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Condensed Matter - Mesoscale and Nanoscale Physics
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