期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7678
关键词
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资金
- Italian MIUR [RBAP115AYN, 2010NR4MXA]
- Universita di Genova
- Swiss National Science Foundation through the National Center of Competence in Research, Materials with Novel Electronic Properties, 'MaNEP'
- 'Thermoelectric oxides TEO' project
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC [319286]
- CompuNet
- Italian Institute of Technology (IIT)
- CAR of Universita di Cagliari
- Fondazione Banco di Sardegna Projects
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 10(4)-10(5) mu VK-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.
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