Magnetic field anti-symmetry of photovoltaic voltage in evanescent microwave fields

Details Magnetic field anti-symmetry of photovoltaic voltage in evanescent microwave fields Magnetic field anti-symmetry of photovoltaic voltage in evanescent microwave fields

2008-09-29

arxiv.org/abs/0809.4948v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

A two dimensional electron system without spatial inversion symmetry develops a sample specific dc voltage when exposed to a microwave radiation at low temperature. We investigate this photovoltaic (PV) effect, in the case where spatial symmetry is broken by an evanescent high-frequency potential. We measure the induced PV voltage in a ${\rm GaAs/Ga_{1-x}Al_{x}As}$ Hall bar at magnetic fields in the Tesla range. We find that in this regime the induced PV voltage is anti-symmetric with magnetic field, and exhibits regular Shubnikov-de Haas like oscillations. Our experimental results can be understood from a simple model, which describes the effect of stationary orbital currents caused by microwave driving.

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