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 are 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.
@article{arxiv.1209.6551,
title = {Quantum oscillations from a two-dimensional electron gas at a Mott/band insulator interface},
author = {Pouya Moetakef and Daniel G. Ouellette and James R. Williams and S. James Allen and Leon Balents and David Goldhaber-Gordon and Susanne Stemmer},
journal= {arXiv preprint arXiv:1209.6551},
year = {2015}
}
Comments
The following article has been accepted by Applied Physics Letters. After it is published, it will be found at http://apl.aip.org