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VOLUME 58 (1993) | ISSUE 7 | PAGE 538
Mesoscopic photovoltaic effect in an electron interferometer
A photovoltaic effect has been observed in a ring electron interferometer using a AlGaAs/GaAs heterojunction. It is induced at Γ< 4.2 К by microwave radiation in the form of an emf which oscillates as a function of the magnetic field. The oscillation period is equal to the period of the oscillation in the resistance and corresponds to a change in the magnetic flux across the interferometer by an amount equal to the flux quantum Ф0 = /г/е. The observed effect is shown to be of a mesoscopic nature.