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

Rössle, Matthias; Kim, Kyung Wan; Dubroka, Adam; Marsik, Premysl; Wang, Chen Nan; Jany, R.; Richter, C.; Mannhart, J.; Schneider, C. W.; Frano, A.; Wochner, P.; Lu, Y.; Keimer, B.; Shukla, D. K.; Strempfer, J.; Bernhard, Christian

doi:10.1103/PhysRevLett.110.136805

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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
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

27.03.2013

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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