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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.13: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Time evolution of the non-thermal phonon gas after laser excitation in antimony — •Sergej Krylow, Bernd Bauerhenne, Tobias Zier, Eeuwe S. Zijlstra, and Martin E. Garcia — Universität Kassel, Theoretische Physik II, Heinrich-Plett-Straße 40, 34132 Kassel,Germany

We study the decay of the femtosecond-laser excited coherent A_1g phonon mode in antimony using electronic temperature dependent density-functional-theory molecular-dynamics simulations for supercells with 576 atoms, in which a decay time due to phonon-phonon interactions of about 3 ps can be seen. By utilizing a second type of MD simulations where the A_1g phonon is de-occuppied after laser excitation we are able to unravel the decay channels without relying on the usual perturbative approaches. In particular, we can see two decay channels which depend on the applied laser fluence and which we account to a third and a fourth order scattering process.