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Electric-Field-Induced Polar Order and Localization of the Confined Electrons in LaAlO₃/SrTiO₃ Heterostructures
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Rössle, Matthias
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
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Kim, Kyung Wan
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland - Department of Physics, Chungbuk National University, Cheongju, Korea
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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
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Marsik, Premysl
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
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Wang, Chen Nan
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
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Jany, R.
Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany
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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
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Mannhart, J.
Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
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Schneider, C. W.
Paul Scherrer Institut, Villigen, Switzerland
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Frano, A.
Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany - Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
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Wochner, P.
Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany
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Lu, Y.
Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
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Keimer, B.
Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
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Shukla, D. K.
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
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Strempfer, J.
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
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Bernhard, Christian
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Biological sciences
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/302944
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