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Thermopower in oxide heterostructures: The importance of being multiple-band conductors

Published inPhysical Review. B, Condensed Matter, vol. 86, 195301
Publication date2012
Abstract

We combine transport experiments, advanced ab initio calculations, and model analysis to determine the thermoelectric power in the two-dimensional electron gas formed at the paradigmatic oxide interface SrTiO3/LaAlO3. We demonstrate that contrary to popular expectation, quantum confinement does not enhance the thermoelectric power of the electron gas at this interface with respect to its corresponding three-dimensional case. Our analysis directly relates the thermopower behavior to band structure characteristics typical of the oxide heterostructure (i.e., on-site and intersite band splitting), furnishing general interpretive prescriptions to search for oxide heterostructures with improved thermoelectric capabilities.

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Citation (ISO format)
FILIPPETTI, A. et al. Thermopower in oxide heterostructures: The importance of being multiple-band conductors. In: Physical Review. B, Condensed Matter, 2012, vol. 86, p. 195301. doi: 10.1103/PhysRevB.86.195301
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ISSN of the journal1098-0121
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