Mapping Band Alignment across Complex Oxide Heterointerfaces
Abstract
In this study, direct observation of the evolution of electronic structures across complex oxide interfaces has been revealed in the LaAlO3/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.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2012
- DOI:
- 10.1103/PhysRevLett.109.246807
- Bibcode:
- 2012PhRvL.109x6807H
- Keywords:
-
- 73.20.-r;
- 68.35.-p;
- 68.37.-d;
- Electron states at surfaces and interfaces;
- Solid surfaces and solid-solid interfaces: Structure and energetics;
- Microscopy of surfaces interfaces and thin films