Dynamical response and confinement of the electrons at the LaAlO₃/SrTiO₃ interface

Dubroka, Adam; Rössle, Matthias; Kim, Kyung Wan; Malik, Vivek Kumar; Schulz, Leander; Thiel, S.; Schneider, C. W.; Mannhart, J.; Herranz, G.; Copie, O.; Bibes, M.; Barthélémy, A.; Bernhard, Christian

doi:10.1103/PhysRevLett.104.156807

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Journal article

Dynamical response and confinement of the electrons at the LaAlO₃/SrTiO₃ interface

Dubroka, Adam University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Rössle, Matthias University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Kim, Kyung Wan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Malik, Vivek Kumar University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Schulz, Leander University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Thiel, S. Experimental Physics VI, Institute of Physics, University of Augsburg, Germany
Schneider, C. W. Experimental Physics VI, Institute of Physics, University of Augsburg, Germany - Paul Scherrer Institut, Materials Group, Villigen, Switzerland
Mannhart, J. Experimental Physics VI, Institute of Physics, University of Augsburg, Germany
Herranz, G. Unité Mixte de Physique CNRS/Thales, Palaiseau, France
Copie, O. Unité Mixte de Physique CNRS/Thales, Palaiseau, France
Bibes, M. Unité Mixte de Physique CNRS/Thales, Palaiseau, France
Barthélémy, A. Unité Mixte de Physique CNRS/Thales, Palaiseau, France
Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland

16.04.2010

Published in:

Physical Review Letters. - 2010, vol. 104, p. 156807

English With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO₃ and SrTiO₃. We obtained a sheet carrier concentration of N_s≈5–9×10¹³ cm⁻², an effective mass of m^*=3.2±0.4m_e, and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi_1-xNb_xO₃ and therefore suggestive of polaronic correlations. We also determined the vertical concentration profile which has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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