Two-Dimensional Quantum Oscillations of the Conductance at LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Interfaces

Caviglia, Andrea; Gariglio, Stefano; Cancellieri, Claudia; Sacepe, Benjamin; Fete, Alexandre; Reyren, Nicolas; Gabay, M.; Morpurgo, Alberto; Triscone, Jean-Marc

doi:10.1103/PhysRevLett.105.236802

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Title		Two-Dimensional Quantum Oscillations of the Conductance at LaAlO₃/SrTiO₃ Interfaces
Authors		Caviglia, Andrea Gariglio, Stefano Cancellieri, Claudia Sacepe, Benjamin Fete, Alexandre Reyren, Nicolas Gabay, M. Morpurgo, Alberto Triscone, Jean-Marc show all authors [1 - 9]
Published in		Physical Review Letters. 2010, vol. 105, no. 23, p. 236802
Abstract		We report on a study of magnetotransport in LaAlO<sub>3</sub>/SrTiO<sub>3</sub> interfaces characterized by mobilities of the order of several thousands cm2/V s. We observe Shubnikov–de Haas oscillations whose period depends only on the perpendicular component of the magnetic field. This observation directly indicates the formation of a two-dimensional electron gas originating from quantum confinement at the interface. From the temperature dependence of the oscillation amplitude we extract an effective carrier mass m*≃1.45me. An electric field applied in the back-gate geometry increases the mobility, the carrier density, and the oscillation frequency.
Identifiers		DOI: 10.1103/PhysRevLett.105.236802
Full text		Article (Published version) (454 Kb) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Research group		Groupe Triscone
Citation (ISO format)		CAVIGLIA, Andrea et al. Two-Dimensional Quantum Oscillations of the Conductance at LaAlO₃/SrTiO₃ Interfaces. In: Physical Review Letters, 2010, vol. 105, n° 23, p. 236802. doi: 10.1103/PhysRevLett.105.236802 https://archive-ouverte.unige.ch/unige:23532