Photocurrent Oscillation in KTaO₃

Abstract

Low-frequency photocurrent oscillation has been found in pure KTaO₃ at low temperature. The oscillation behavior depends on the light intensity and the applied voltage. The temperature of the illuminated surface of KTaO₃ changes synchronously with the oscillation. It is suggested that these effects are caused by the redistribution of electrons over levels under the influence of Joule heat of the photocurrent.