Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

S.S.A. Seo; Z. Marton; W.S. Choi; G.W.J. Hassink; David 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

S.S.A. Seo, Z. Marton, W.S. Choi, G.W.J. Hassink, David 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 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	Undefined
Pages (from-to)	082107-
Journal	Applied physics letters
Volume	95
Issue number	8
DOIs	https://doi.org/10.1063/1.3213390
Publication status	Published - 2009

Keywords

METIS-261702
IR-72414

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10.1063/1.3213390

Cite this

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title = "Multiple conducting carriers generated in LaAlO3/SrTiO3 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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doi = "10.1063/1.3213390",

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TY - JOUR

T1 - Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures

AU - Seo, S.S.A.

AU - Marton, Z.

AU - Choi, W.S.

AU - Hassink, G.W.J.

AU - Blank, David H.A.

AU - Hwang, H.Y.

AU - Noh, T.W.

AU - Egami, T.

AU - Lee, H.N.

PY - 2009

Y1 - 2009

N2 - 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.

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.

KW - METIS-261702

KW - IR-72414

U2 - 10.1063/1.3213390

DO - 10.1063/1.3213390

M3 - Article

SN - 0003-6951

VL - 95

SP - 082107-

JO - Applied physics letters

JF - Applied physics letters

IS - 8

ER -