Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Ultrafast Phenomena I
O 35.7: Talk
Tuesday, March 8, 2016, 11:00–11:15, H10
Theory of the coherent A1g phonon decay in antimony — •Sergej Krylow, Eeuwe S. Zijlstra, and Martin E. Garcia — Universität Kassel, Theoretische Physik II, Heinrich-Plett-Straße 40, 34132 Kassel,Germany
The fluence-dependent decay paths of the femtosecond laser-excited coherent A1g phonon mode in antimony are investigated by means of electronic-temperature-dependent density-functional-theory molecular-dynamics simulations, which yield an exponentially decaying coherent phonon, comparable to experiments. Additional calculations of the phonon dispersion indicate that third order decay processes occur mainly within the acoustic and fourth order processes within the optical phonon branches. This can also be seen in the subsequent analysis of the molecular dynamics simulations, which reveal that the third and fourth order phonon contributions to the decay can be influenced by means of the applied fluence.