Optical Study of the Free-Carrier Response of ${\mathrm{LaTiO}}_{3}/{\mathrm{SrTiO}}_{3}$ Superlattices
- Seo, S. S. A. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
- Choi, W. S. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
- Lee, H. N. Materials Science and Technology Division, Oak Ridge National Laboratory, USA
- Yu, Li Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
- Kim, Kyung Wan Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
- Bernhard, Christian Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
- Noh, T. W. ReCOE & FPRD, Department of Physics and Astronomy, Seoul National University, Korea
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26.12.2007
Published in:
- Physical Review Letters. - 2007, vol. 99, no. 26, p. 266801
English
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 d 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.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 8732
- DOI 10.1103/PhysRevLett.99.266801
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300429
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