Optical study of the free-carrier response of LaTiO3/SrTiO3 superlattices

S. S.A. Seo, W. S. Choi, H. N. Lee, L. Yu, K. W. Kim, C. Bernhard, T. W. Noh

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66 Scopus citations

Abstract

We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodicity and individual layer thickness, the SLs exhibited a Drude metallic response with sheet carrier density per interface ≈3×1014cm-2. This is probably due to the leakage of d electrons at interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We observed a carrier relaxation time ≈35fs and mobility ≈35cm2V-1s-1 at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO3.

Original languageEnglish
Article number266801
JournalPhysical Review Letters
Volume99
Issue number26
DOIs
StatePublished - Dec 26 2007

ASJC Scopus subject areas

  • General Physics and Astronomy

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