Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
Abstract
We report on a study of magnetotransport in LaAlO3/SrTiO3 interfaces characterized by mobilities of the order of several thousands cm2/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*1.45\,me. An electric field applied in the back-gate geometry increases the mobility, the carrier density and the oscillation frequency.
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