Wedge-shaped potential and Airy-function electron localization in oxide superlattices
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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.
Извор:Physical Review Letters, 2005, 94, 17
ISSN: 0031-9007 (print)