Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition in VO2

DOI to cite this document:: 10.5283/epub.19123

Kübler, C. ; Ehrke, H. ; Huber, Rupert ; Lopez, R. ; Halabica, A. ; Haglund Jr., R. F. ; Leitenstorfer, A.

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Date of publication of this fulltext: 28 Jan 2011 07:20

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Abstract

We directly trace the multi-THz conductivity of VO2 during an insulator-metal transition triggered by a 12-fs light pulse. The femtosecond dynamics of lattice and electronic degrees of freedom are spectrally discriminated. A coherent wave packet motion of V-V dimers at 6 THz modulates the lattice polarizability for approximately 1 ps. In contrast, the electronic conductivity settles to a constant ...