Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 22: Ultrafast Phenomena I (Joint session of HL and O, organized by HL)

HL 22.7: Vortrag

Dienstag, 8. März 2016, 11:00–11:15, H10

Theory of the coherent A_1g 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 A_1g 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.