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. 2007 Nov 30;99(22):226401.
doi: 10.1103/PhysRevLett.99.226401. Epub 2007 Nov 30.

Enhanced photosusceptibility near Tc for the light-induced insulator-to-metal phase transition in vanadium dioxide

D J Hilton  1 , R P Prasankumar, S Fourmaux, A Cavalleri, D Brassard, M A El Khakani, J C Kieffer, A J Taylor, R D Averitt
Affiliations

Enhanced photosusceptibility near Tc for the light-induced insulator-to-metal phase transition in vanadium dioxide

D J Hilton et al. Phys Rev Lett. .

Erratum in

  • Phys Rev Lett. 2008 Jan 11;100(1):019906

Abstract

We use optical-pump terahertz-probe spectroscopy to investigate the near-threshold behavior of the photoinduced insulator-to-metal (IM) transition in vanadium dioxide thin films. Upon approaching Tc a reduction in the fluence required to drive the IM transition is observed, consistent with a softening of the insulating state due to an increasing metallic volume fraction (below the percolation limit). This phase coexistence facilitates the growth of a homogeneous metallic conducting phase following superheating via photoexcitation. A simple dynamic model using Bruggeman effective medium theory describes the observed initial condition sensitivity.

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