Seo, S. S. A. Choi, W. S. Lee, H. N. Yu, Li Kim, Kyung Wan Bernhard, Christian Noh, T. W. 2007-12-26 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 ≈3×10¹⁴ cm⁻². This is probably due to the leakage of <i>d</i> electrons at interfaces from the Mott insulator LaTiO₃ to the band insulator SrTiO₃. We observed a carrier relaxation time ≈35 fs and mobility ≈35 cm² V⁻¹ s⁻¹ at 10 K, and an unusual temperature dependence of carrier density that was attributed to the dielectric screening of quantum paraelectric SrTiO₃. application/pdf https://folia.unifr.ch/global/documents/300429 https://folia.unifr.ch/documents/300429/files/bernhard_osf.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.99.266801 info:eu-repo/semantics/openAccess License undefined Physical Review Letters. - 2007, vol. 99, no. 26, p. 266801 info:eu-repo/classification/udc/53 Optical Study of the Free-Carrier Response of ${\mathrm{LaTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ Superlattices http://purl.org/coar/resource_type/c_6501