Faculté des sciences

Two-dimensional confinement of 3d¹ electrons in LaTiO₃/LaAlO₃ multilayers

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

In: Physical Review Letters, 2010, vol. 104, no. 3, p. 036401

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... Plus

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    Summary
    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 t₂ states leaving only the planar dxy orbitals occupied. We outline that these multilayers can serve as a model system for the study of the t₂ 2D Hubbard model.