Giant oscillating thermopower at oxide interfaces

Ilaria Pallecchi, Francesca Telesio, Danfeng Li, Alexandre Fête, Stefano Gariglio, Jean-Marc Triscone, Alessio Filippetti, Pietro Delugas, Vincenzo Fiorentini and Daniele Marré ()
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Ilaria Pallecchi: CNR-SPIN and Genova University
Francesca Telesio: CNR-SPIN and Genova University
Danfeng Li: University of Geneva
Alexandre Fête: University of Geneva
Stefano Gariglio: University of Geneva
Jean-Marc Triscone: University of Geneva
Alessio Filippetti: CNR-IOM UOS Cagliari, Università di Cagliari
Pietro Delugas: CompuNet, Istituto Italiano di Tecnologia—IIT
Vincenzo Fiorentini: Università di Cagliari, CNR-IOM
Daniele Marré: CNR-SPIN and Genova University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Understanding the nature of charge carriers at the LaAlO3/SrTiO3 interface is one of the major open issues in the full comprehension of the charge confinement phenomenon in oxide heterostructures. Here, we investigate thermopower to study the electronic structure in LaAlO3/SrTiO3 at low temperature as a function of gate field. In particular, under large negative gate voltage, corresponding to the strongly depleted charge density regime, thermopower displays high negative values of the order of 104–105μVK−1, oscillating at regular intervals as a function of the gate voltage. The huge thermopower magnitude can be attributed to the phonon-drag contribution, while the oscillations map the progressive depletion and the Fermi level descent across a dense array of localized states lying at the bottom of the Ti 3d conduction band. This study provides direct evidence of a localized Anderson tail in the two-dimensional electron liquid at the LaAlO3/SrTiO3 interface.

Date: 2015
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DOI: 10.1038/ncomms7678

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