Ultrafast changes in lattice symmetry probed by coherent phonons in VO$_2$

Details Ultrafast changes in lattice symmetry probed by coherent phonons in VO$_2$ Ultrafast changes in lattice symmetry probed by coherent phonons in VO$_2$

2010-12-07

arxiv.org/abs/1012.1468v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, supplementary information

Scientific paper

The effect of an ultrafast change in crystal symmetry on the coherent response of the lattice is investigated using the photoinduced semiconductor-metal phase transition in VO$_2$. Below the photoinduced phase transition threshold, the four lowest $A_g$ phonon modes of the monoclinic phase modulate the transient reflectivity. As the pump intensity is increased, a photoinduced phase transition occurs resulting in a prompt change in the phonon dynamics. These measurements observe lattice dynamics on a timescale previously inaccessible to current lattice probes and show that the photoinduced phase transition is driven by excited electrons changing the lattice potential symmetry.

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