Enhanced photosusceptibility near Tc for the light-induced insulator-to-metal phase transition in vanadium dioxide |
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| Authors: | Hilton D J Prasankumar R P Fourmaux S Cavalleri A Brassard D El Khakani M A Kieffer J C Taylor A J Averitt R D |
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| Institution: | Center for Integrated Nanotechnologies, MS K771, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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| 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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