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Two-Dimensional Quantum Oscillations of the Conductance at LaAlO3/SrTiO3 Interfaces

Gabay, M.
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Published in Physical review letters. 2010, vol. 105, no. 23, 236802
Abstract We report on a study of magnetotransport in LaAlO3/SrTiO3 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.
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Research groups Groupe Caviglia
Groupe Morpurgo
Groupe Triscone
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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

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Deposited on : 2012-10-24

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