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
- Marsik, 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
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- English
- Classification
- Biological sciences
- License
- License undefined
- Identifiers
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- RERO DOC 31944
- DOI 10.1103/PhysRevLett.110.136805
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302944
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