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

  • Rössle, Matthias University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
  • Kim, Kyung Wan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland - Department of Physics, Chungbuk National University, Cheongju, Korea
  • Dubroka, Adam University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland - Department of Condensed Matter Physics, Faculty of Science, Masaryk University and Central European Institute of Technology, Brno, Czech Republic
  • Maršík, Premysl University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
  • Wang, Chen Nan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
  • Jany, R. Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany
  • Richter, C. Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany - Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Mannhart, J. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Schneider, C. W. Paul Scherrer Institut, Villigen, Switzerland
  • Frano, A. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
  • Wochner, P. Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany
  • Lu, Y. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Keimer, B. Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
  • Shukla, D. K. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
  • Strempfer, J. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
  • Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
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    27.03.2013
Published in:
  • Physical Review Letters. - 2013, vol. 110, no. 13, p. 136805
English 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 ∼50  K and exhibit similar, unipolar hysteresis loops as a function of the gate voltage.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Biology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/302944
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