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arXiv · 0908.1358

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
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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.

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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. 2009-08-10. Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures. https://doi.org/10.1063/1.3213390

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