Multiple conducting carriers generated in LaAlO3 / SrTiO 3 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 / SrTiO ₃ 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

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

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 mobility determined by dc-transport in the LaAlO₃ / SrTiO₃ heterostructures is much higher than that extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.

Original language	English
Article number	082107
Journal	Applied Physics Letters
Volume	95
Issue number	8
DOIs	https://doi.org/10.1063/1.3213390
State	Published - 2009

Funding

We thank I. Ivanov and H. M. Christen for useful discussions. This work was sponsored by the Division of Materials Sciences and Engineering, U. S. Department of Energy, a nanotechnology program of the Dutch Ministry of Economic Affairs (NanoNed), and National Science Foundation by Grant No. DMR04-04781.

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title = "Multiple conducting carriers generated in LaAlO3 / SrTiO 3 heterostructures",

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 mobility determined by dc-transport in the LaAlO3 / SrTiO3 heterostructures is much higher than that extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.",

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AU - Seo, S. S.A.

AU - Marton, Z.

AU - Choi, W. S.

AU - Hassink, G. W.J.

AU - Blank, D. H.A.

AU - Hwang, H. Y.

AU - Noh, T. W.

AU - Egami, T.

AU - Lee, H. N.

PY - 2009

Y1 - 2009

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AB - 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 mobility determined by dc-transport in the LaAlO3 / SrTiO3 heterostructures is much higher than that extracted by optical method, we attribute the origin of high-mobility transport to the low-density conducting carriers.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Multiple conducting carriers generated in LaAlO₃ / SrTiO ₃ heterostructures

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