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


Seo, S.S.A. and Han, M.J. and Hassink, G.W.J. and Choi, W.S. and Moon, S.J. and Kim, J.S. and Susaki, T. and Lee, Y.S. and Yu, J. and Bernhard, C. and Hwang, H.Y. and Rijnders, G. and Blank, D.H.A. and Keimer, B. and Noh, T.W. (2010) Two-Dimensional Confinement of 3d1 Electrons in LaTiO3/LaAlO3 Multilayers. Physical Review Letters, 104 (3). 036401. ISSN 0031-9007

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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.
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