Two-Dimensional Confinement of 3d(1) Electrons in LaTiO3/LaAlO3 Multilayers

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We report spectroscopic ellipsometry measurements of the anisotropy of the interband transitions parallel and perpendicular to the planes of (LaTiO3)n(LaAlO3)5 multilayers with n = 1-3. These provide direct information about the electronic structure of the two-dimensional (2D) 3d(1) state of the Ti ions. In combination with local density approximation, including a Hubbard U calculation, we suggest that 2D confinement in the TiO2 slabs lifts the degeneracy of the t(2g) states leaving only the planar d(xy) orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t(2g) 2D Hubbard model.
Publisher
AMER PHYSICAL SOC
Issue Date
2010-01
Language
English
Article Type
Article
Keywords

MOTT INSULATOR; ORBITAL LIQUID; SUPERLATTICES; METAL; HETEROSTRUCTURES; RECONSTRUCTION; INTERFACE; LATIO3; CU

Citation

PHYSICAL REVIEW LETTERS, v.104, no.3

ISSN
0031-9007
DOI
10.1103/PhysRevLett.104.036401
URI
http://hdl.handle.net/10203/103064
Appears in Collection
PH-Journal Papers(저널논문)
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