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, and T. W. Noh
Phys. Rev. Lett. 104, 036401 – Published 19 January 2010
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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=13. 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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  • Received 23 October 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.036401

©2010 American Physical Society

Authors & Affiliations

S. S. A. Seo1,2,*, M. J. Han1,†, G. W. J. Hassink3,4, W. S. Choi1, S. J. Moon1, J. S. Kim2,‡, T. Susaki3, Y. S. Lee5, J. Yu1, C. Bernhard6, H. Y. Hwang3,7, G. Rijnders4, D. H. A. Blank4, B. Keimer2, and T. W. Noh1,§

  • 1Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  • 2Max-Planck-Institut für Festkörperforschung, Stuttgart D-70569, Germany
  • 3Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 4MESA+ Institute for Nanotechnology, University of Twente, Enschede NL-7500 AE, The Netherlands
  • 5Department of Physics, Soongsil University, Seoul 156-743, Korea
  • 6Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, 1700 Fribourg, Switzerland
  • 7Japan Science and Technology Agency, Kawaguchi 332-0012, Japan

  • *Current address: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. seos@ornl.gov
  • Current address: Department of Physics, Columbia University, New York, NY 10027, USA.
  • Current address: Department of Physics, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Korea.
  • §twnoh@snu.ac.kr

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Issue

Vol. 104, Iss. 3 — 22 January 2010

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