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arXiv · 1007.4941

Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces

A. D. Caviglia·S. Gariglio·C. Cancellieri·B. Sacépé·A. Fête·N. Reyren·M. Gabay·A. F. Morpurgo·J. -M. Triscone
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Abstract

We report on a study of magnetotransport in LaAlO3/SrTiO3 interfaces characterized by mobilities of the order of several thousands cm$^{2}$/Vs. We observe Shubnikov-de Haas oscillations that indicate a two-dimensional character of the Fermi surface. The frequency of the oscillations signals a multiple sub-bands occupation in the quantum well or a multiple valley configuration. From the temperature dependence of the oscillation amplitude we extract an effective carrier mass $m^{*}\simeq1.45$\,$m_{e}$. An electric field applied in the back-gate geometry increases the mobility, the carrier density and the oscillation frequency.

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A. D. Caviglia, S. Gariglio, C. Cancellieri, B. Sacépé, A. Fête, N. Reyren, M. Gabay, A. F. Morpurgo, J. -M. Triscone. 2010-07-28. Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces. https://doi.org/10.1103/physrevlett.105.236802

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