title: Wedge-shaped potential and Airy-function electron localization in oxide superlattices.
abstract: Oxide superlattices and microstructures hold the promise for creating a new class of devices with unprecedented functionalities. Density-functional studies of the recently fabricated, lattice-matched perovskite titanates (SrTiO3)n/(LaTiO3)m reveal a classic wedge-shaped potential well for the monolayer (m = 1) structure, originating from the Coulomb potential of a two-dimensional charged La sheet. The potential in turn confines the electrons in the Airy-function-localized states. Magnetism is suppressed for the monolayer structure, while in structures with a thicker LaTiO3 part, bulk antiferromagnetism is recovered, with a narrow transition region separating the magnetic LaTiO3 and the nonmagnetic SrTiO3.
authors.affiliation: Department of Physics, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: Z S
authors.initials: ZS
authors.lastname: Popovic
authors.forename: S
authors.initials: S
authors.lastname: Satpathy