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Stähler, J.
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article
Tracking the evolution of electronic and structural properties of VO 2 during the ultrafast photoinduced insulator-metal transition
Abstract
<p>We present a detailed study of the photoinduced insulator-metal transition in VO<sub>2</sub> with broadband time-resolved reflection spectroscopy. This allows us to separate the response of the lattice vibrations from the electronic dynamics and observe their individual evolution. When we excite VO<sub>2</sub> above the photoinduced phase transition threshold, we find that the restoring forces that describe the ground-state monoclinic structure are lost during the excitation process, suggesting that an ultrafast change in the lattice potential drives the structural transition. However, by performing a series of pump-probe measurements during the nonequilibrium transition, we observe that the electronic properties of the material evolve on a different, slower time scale. This separation of time scales suggests that the early state of VO<sub>2</sub>, immediately after photoexcitation, is a nonequilibrium state that is not well defined by either the insulating or the metallic phase.</p>