Back to Search
Start Over
Interface relaxation and electrostatic charge depletion in the oxide heterostructure LaAlO3/SrTiO3
- Publication Year :
- 2009
-
Abstract
- Performing an analysis within density functional theory, we develop insight into the structural and electronic properties of the oxide heterostructure LaAlO3/SrTiO3. Electrostatic surface effects are decomposed from the internal lattice distortion in order to clarify their interplay. We first study the interface relaxation by a multi-layer system without surface, and the surface effects, separately, by a substrate-film system. While elongation of the TiO6 octahedra at the interface enhances the metallicity, reduction of the film thickness has the opposite effect due to a growing charge depletion. The interplay of these two effects, as reflected by the full lattice relaxation in the substrate-film system, however, strongly depends on the film thickness. An inversion of the TiO6 distortion pattern for films thinner than four LaAlO3 layers results in an insulating state.<br />Comment: 10 pages, 7 figures, accepted by Europhysics Letters
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.0903.5196
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1209/0295-5075/86/27005