Figure 1. Chemical mapping with atomic resolution of LaAlO₃/SrTiO₃ interface.

(a) High resolution STEM image of LAO/STO interface. The LAO and STO regions are clearly distinguished from each other in those regions far from interface (>~u.c.). (b) High-magnification STEM image of LAO/STO interface, showing the detailed microstructures close to the interface. (c) to (g) are atomically resolved chemical mapping of Al, La, Ti, Sr, and O respectively, obtained in the same area as (b). Scale bars, 1 nm.