Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers

S.S.A. Seo, M.J. Han, G.W.J. Hassink, W.S. Choi, S.J. Moon, J.S. Kim, T. Susaki, Y-S Lee, J. Yu, C. Bernhard, H.Y. Hwang, G. Rijnders, D.H.A. Blank, B. Keimer, T.W. Noh

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Abstract

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) 3d1 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 t2g states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t2g 2D Hubbard model.
Original languageEnglish
Pages (from-to)036401
JournalPhysical review letters
Volume104
Issue number3
DOIs
Publication statusPublished - 2010

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