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Conferences > ICUSD > 2012 > IW4D > IW4D.1

Ultrafast changes in lattice symmetry probed by coherent phonons at the onset of the photoinduced phase transition in VO2

S. Wall, D. Wegkamp, L. Foglia, K. Appavoo, J. Nag, R. F. Haglund, J. Stähler, and M. Wolf

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Abstract

We show that the coherent phonon spectrum, probed by whitelight spectroscopy, can be a marker for photoinduced structural transitions. In VO2, the lattice potential symmetry is completely changed on ultrafast timescales before ionic motion occurs.

© 2012 Optical Society of America

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