期刊
APPLIED PHYSICS LETTERS
卷 97, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3518482
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Terahertz time-domain spectroscopy is used to measure the complex terahertz conductivity of a nanogranular vanadium dioxide (VO2) 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. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3518482]
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