Abstract
A mesoscopic photovoltaic effect has been observed in a quasiballistic ring shaped electron interferometer, fabricated on the basis of AlGaAs/GaAs heterostructure. The photovoltaic effect shows up at T < 4.2 K as the sample is put under microwave radiation and manifests itself as an e.m.f. oscillating with the variation of magnetic field. The e.m.f. oscillations' period corresponds to a change of h/ e (the flux quantum) in the magnetic flux through the interferometer area. In magnetic fields greater than 2 T the periodical component of the e.m.f. dies out.
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