Electric-Field-Induced Polar Order and Localization of the Confined Electrons in LaAlO3/SrTiO3 Heterostructures

M. Rössle, K. W. Kim, A. Dubroka, P. Marsik, C. N. Wang, R. Jany, C. Richter, J. Mannhart, C. W. Schneider, A. Frano, P. Wochner, Y. Lu, B. Keimer, D. K. Shukla, J. Strempfer, and C. Bernhard
Phys. Rev. Lett. 110, 136805 – Published 27 March 2013
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Abstract

With ellipsometry, x-ray diffraction, and resistance measurements we investigated the electric-field effect on the confined electrons at the LaAlO3/SrTiO3 interface. We obtained evidence that the localization of the electrons at negative gate voltage is induced, or at least enhanced, by a polar phase transition in SrTiO3 which strongly reduces the lattice polarizability and the subsequent screening. In particular, we show that the charge localization and the polar order of SrTiO3 both develop below 50K and exhibit similar, unipolar hysteresis loops as a function of the gate voltage.

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  • Received 17 September 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.136805

© 2013 American Physical Society

Authors & Affiliations

M. Rössle1, K. W. Kim1,2, A. Dubroka1,3, P. Marsik1, C. N. Wang1, R. Jany4, C. Richter4,5, J. Mannhart5, C. W. Schneider6, A. Frano5,7, P. Wochner8, Y. Lu5, B. Keimer5, D. K. Shukla9, J. Strempfer9, and C. Bernhard1,*

  • 1University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
  • 2Department of Physics, Chungbuk National University, Cheongju 361-763, Korea
  • 3Department of Condensed Matter Physics, Faculty of Science, Masaryk University and Central European Institute of Technology, Kotlár̆ská 2, CZ-61137 Brno, Czech Republic
  • 4Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany
  • 5Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 6Paul Scherrer Institut, CH-5232 Villigen, Switzerland
  • 7Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
  • 8Max-Planck-Institut für Intelligente Systeme, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
  • 9Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22603 Hamburg, Germany

  • *christian.bernhard@unifr.ch

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Vol. 110, Iss. 13 — 29 March 2013

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