Publications by Andrea Cavalleri

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

Phys Rev Lett 99 (2007) 226401-

DJ Hilton, RP Prasankumar, S Fourmaux, A Cavalleri, D Brassard, MA El Khakani, JC Kieffer, AJ Taylor, RD Averitt

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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