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    2 results 1
    Université de Fribourg

    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...

    Université de Fribourg

    Optical Study of the Free-Carrier Response of ${\mathrm{LaTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ Superlattices

    Seo, S. S. A. ; Choi, W. S. ; Lee, H. N. ; Yu, Li ; Kim, Kyung Wan ; Bernhard, Christian ; Noh, T. W.

    In: Physical Review Letters, 2007, vol. 99, no. 26, p. 266801

    We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO₃/SrTiO₃ superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×10¹⁴ cm⁻². This is probably due to the leakage of d electrons at...

    2 results 1