In this study, direct observation of the evolution of electronic structures across complex oxide interfaces has been revealed in the LaAlO 3/SrTiO3 model system using cross-sectional scanning tunneling microscopy and spectroscopy. The conduction and valence band structures across the LaAlO3/SrTiO3 interface are spatially resolved at the atomic level by measuring the local density of states. This study directly maps out the electronic reconstructions and a built-in electric field in the polar LaAlO3 layer. Results also clearly reveal the band bending and the notched band structure in the SrTiO3 adjacent to the interface.
|Number of pages||5|
|Journal||Physical Review Letters|
|State||Published - 12 Dec 2012|