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 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 $m^{\ast }\simeq 1.45$\,$m_e$. An electric field applied in the back-gate geometry increases the mobility, the carrier density and the oscillation frequency.

4 pages, 4 figures

References in corpus (4)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Electron-phonon interaction and charge carrier mass enhancement in SrTiO3

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