Polarity switching of the photo-induced voltage in YBCO/Ag heterojunction. (March 2020) - Yang, Feng
Abstract: Striking photo-induced voltage is observed in YBCO/Ag heterojunction irradiated with purple laser, revealing that there is an intrinsic built-in electric field in the interface. The dynamic evolution and devolution processes of the photo-induced voltage are studied at 50 K and 300 K respectively, which are found to be similar to a charging and a discharging process of a plate capacitor. Unusual Current-Voltage properties curves obtained at 80 K with 28.4 mW/mm 2 laser irradiation implies a polarity switching of the built-in electric field in the interface and witnesses a redistribution of charges near the interface of the heterojunction. This research would suggest a new method to study the proximity effect in the interface of superconductor/metal heterojunction. Highlights: Striking photo-induced voltage is observed in YBCO/Ag heterojunction irradiated with purple laser. The dynamic evolution and devolution processes of the photo-induced voltage. Unusual I-V curve witnesses a polarity switching of the built-in electrical field in the interface.