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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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

IS - 8

M1 - 082107

ER -

Multiple conducting carriers generated in LaAlO₃ / SrTiO ₃ heterostructures

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