Ferroelectric control of the conduction at the LaAlO3/SrTiO 3 heterointerface

Abstract

Modulation of band bending at a complex oxide heterointerface by a ferroelectric layer is demonstrated. The as-grown polarization (Pup) leads to charge depletion and consequently low conduction. Switching the polarization direction (Pdown) results in charge accumulation and enhances the conduction at the interface. The metal-insulator transition at a conducting polar/nonpolar oxide heterointerface can be controlled by ferroelectric doping. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.