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Optical-pump terahertz-probe spectroscopy is used to investigate ultrafastfar-infrared conductivity dynamics during the insulator-to-metal transition(IMT) in vanadium sesquioxide (V2O3). The resultant conductivity increaseoccurs on a tens of ps timescale, exhibiting a strong dependence on the initialtemperature and fluence. We have identified a scaling of the conductivitydynamics upon renormalizing the time axis with a simple power law (alpha = 1/2)that depends solely on the initial, final, and conductivity onset temperatures.Qualitative and quantitative considerations indicate that the dynamics arisefrom nucleation and growth of the metallic phase which can be described by theAvrami model. We show that the temporal scaling arises from spatial scaling ofthe growth of the metallic volume fraction, highlighting the self-similarnature of the dynamics. Our results illustrate the important role played bymesoscopic effects in phase transition dynamics.

Dynamic conductivity scaling in photoexcited V2O3 thin films