Journal article

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

  • Seo, S. S. A. Department of Physics and Astronomy, Seoul National University, Korea - Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA
  • Han, M. J. Department of Physics and Astronomy, Seoul National University, Korea - Department of Physics, Columbia University, New York, USA
  • Hassink, G. W. J. Department of Advanced Materials Science, University of Tokyo, Japan - MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
  • Choi, W. S. Department of Physics and Astronomy, Seoul National University, Korea
  • Moon, S. J. Department of Physics and Astronomy, Seoul National University, Korea
  • Kim, J. S. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Department of Physics, Pohang University of Science and Technology, Pohang, Korea
  • Susaki, T. Department of Advanced Materials Science, University of Tokyo, Japan
  • Lee, Y. S. Department of Physics, Soongsil University, Seoul, Korea
  • Yu, Jun Department of Physics and Astronomy, Seoul National University, Korea
  • Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Hwang, H. Y. Department of Advanced Materials Science, University of Tokyo, Japan -
  • Rijnders, G. MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
  • Blank, D. H. A. MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
  • Keimer, B. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Noh, T. W. Department of Physics and Astronomy, Seoul National University, Korea
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    19.01.2010
Published in:
  • Physical Review Letters. - 2010, vol. 104, no. 3, p. 036401
English 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.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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Persistent URL
https://folia.unifr.ch/unifr/documents/301332
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