1. Terahertz conductivity of the metal-insulator transition in a nanogranular VO2 film.
- Author
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Cocker, T. L., Titova, L. V., Fourmaux, S., Bandulet, H. -C., Brassard, D., Kieffer, J. -C., El Khakani, M. A., and Hegmann, F. A.
- Subjects
METAL-insulator transitions ,ELECTRIC properties of thin films ,TERAHERTZ spectroscopy ,TIME-domain analysis ,VANADIUM ,METALLIC oxides ,METALLIC films ,ELECTRIC conductivity - Abstract
Terahertz time-domain spectroscopy is used to measure the complex terahertz conductivity of a nanogranular vanadium dioxide (VO
2 ) thin film as a function of temperature through the metal-insulator transition. The Drude-Smith model provides a good fit to the observed terahertz conductivity, revealing a metallic state that forms via switching of individual nanograins and strong carrier confinement within the nanograins due to scattering off grain boundaries. Furthermore, the directly applied Drude-Smith model provides a more accurate description of the measured terahertz conductivity in this material than either Bruggeman or Maxwell-Garnett effective medium theories. [ABSTRACT FROM AUTHOR]- Published
- 2010
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