TY - JOUR
T1 - Thermopower in oxide heterostructures
T2 - The importance of being multiple-band conductors
AU - Filippetti, A.
AU - Delugas, P.
AU - Verstraete, M. J.
AU - Pallecchi, I.
AU - Gadaleta, A.
AU - Marré, D.
AU - Li, D. F.
AU - Gariglio, S.
AU - Fiorentini, V.
PY - 2012/11/5
Y1 - 2012/11/5
N2 - 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 SrTiO 3/LaAlO 3. 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.
AB - 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 SrTiO 3/LaAlO 3. 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.
UR - http://www.scopus.com/inward/record.url?scp=84869044882&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.86.195301
DO - 10.1103/PhysRevB.86.195301
M3 - Article
AN - SCOPUS:84869044882
SN - 1098-0121
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 19
M1 - 195301
ER -