Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

S. S. A. Seo; Z. Marton; W. S. Choi; G. W. J. Hassink; D. H. A. Blank; H. Y. Hwang; T. W. Noh; T. Egami; H. N. Lee

doi:10.1063/1.3213390

Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

Strongly Correlated Electrons 2013-09-09 v1

Authors: S. S. A. Seo , Z. Marton , W. S. Choi , G. W. J. Hassink , D. H. A. Blank , H. Y. Hwang , T. W. Noh , T. Egami , H. N. Lee

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Abstract

We have found that there is more than one type of conducting carriers generated in LaAlO3/SrTiO3 heterostructures by comparing the sheet carrier density and mobility from optical transmission spectroscopy with those from dc-transport measurements. When multiple types of carriers exist, optical characterization dominantly reflects the contribution from the high-density carriers whereas dc-transport measurements may exaggerate the contribution of the high-mobility carriers even though they are present at low-density. Since the low-temperature mobilities determined by dc-transport in the LaAlO3/SrTiO3 heterostructures are much higher than those extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.

Keywords

oxide heterostructures charge carrier mobility

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@article{arxiv.0908.1358,
  title  = {Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures},
  author = {S. S. A. Seo and Z. Marton and W. S. Choi and G. W. J. Hassink and D. H. A. Blank and H. Y. Hwang and T. W. Noh and T. Egami and H. N. Lee},
  journal= {arXiv preprint arXiv:0908.1358},
  year   = {2013}
}

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3 figures, supplemental material

Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

Abstract

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