Non-collinear and asymmetric polar moments at back-gated SrTiO3 interfaces
Non-collinear and asymmetric polar moments at back-gated SrTiO3 interfaces
Abstract The mechanism of the gate-field-induced metal-to-insulator transition of the electrons at the interface of SrTiO 3 with LaAlO 3 or AlO x is of great current interest. Here, we show with infrared ellipsometry and confocal Raman spectroscopy that an important role is played by a polar lattice distortion that …