Light-matter interaction of the polar-polar interface LaVO3-KTaO3 (111)

Abstract

KTaO3 (KTO) has emerged as a potential candidate in the spintronics block showing the emergent phenomena in its bulk form as well as thin films, especially in KTO-based heterostructures and interfaces. In this work, we have grown a thin film of polar Mott insulator LaVO3 (LVO) on polar band insulator KTO (111) using the pulsed laser deposition technique. This interfce shows the insulator-to-metal transition. We have studied the photoelectrical properties by using a blue laser light of wavelength 405 nm for illumination in temperatures ranging from 76 K and 300 K. Under blue light illumination, the interface shows enhancement in conductivity, for both 76 K to 300 K. This system has shown the persistent photoconductivity as well. Further, electrostatic gating has also been applied to tune the charge carrier density and the conductivity is increased by around 23 % under the effect of light and electrostatic gating.