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

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


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 languageEnglish
Article number082107
JournalApplied Physics Letters
Issue number8
StatePublished - 2009

Bibliographical note

Funding Information:
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.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Multiple conducting carriers generated in LaAlO3 / SrTiO 3 heterostructures'. Together they form a unique fingerprint.

Cite this