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


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
Issue number26
StatePublished - Dec 26 2007

ASJC Scopus subject areas

  • General Physics and Astronomy


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