Quantum oscillations from a two-dimensional electron gas at a Mott/band insulator interface

We report on the magnetotransport properties of a prototype Mott insulator/band insulator perovskite heterojunction in magnetic fields up to 31 T and at temperatures between 360 mK and 10 K. Shubnikov-de Haas oscillations in the magnetoresistance are observed. The oscillations are two-dimensional in...

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Bibliographic Details
Published in:Applied physics letters 2012-10, Vol.101 (15)
Main Authors: Moetakef, Pouya, Ouellette, Daniel G., Williams, James R., James Allen, S., Balents, Leon, Goldhaber-Gordon, David, Stemmer, Susanne
Format: Article
Language:English
Subjects:
Insulators
Magnetic fields
Magnetic properties
Magnetoresistance
Magnetoresistivity
Oscillations
Temperature dependence
Transport properties
Two dimensional
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Summary:We report on the magnetotransport properties of a prototype Mott insulator/band insulator perovskite heterojunction in magnetic fields up to 31 T and at temperatures between 360 mK and 10 K. Shubnikov-de Haas oscillations in the magnetoresistance are observed. The oscillations are two-dimensional in nature and are interpreted as arising from either a single, spin-split subband or two subbands. In either case, the electron system that gives rise to the oscillations represents only a fraction of the electrons in the space charge layer at the interface. The temperature dependence of the oscillations is used to extract an effective mass of ∼1 me for the subband(s). The results are discussed in the context of the t2g-states that form the bottom of the conduction band of SrTiO3.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4758989