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 languageUndefined
Pages (from-to)082107-
JournalApplied physics letters
Volume95
Issue number8
DOIs
Publication statusPublished - 2009

Keywords

  • METIS-261702
  • IR-72414

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