Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.48: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Ab-initio dynamics of highly excited amorphous graphene — Sergej Krylow, Othmane Benhayoun, •Lukas Nöding, Marie Kempkes, Tobias Zier, and Martin E. Garcia — Theoretische Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Amorphous materials are ubiquitous in todays society. However, many properties of amorphous media are still not understood, and pose a challenge to theoretical and experimental methods. Here, we analyze the response of amorphous carbon to an intense ultrafast laser pulse using ab-initio molecular dynamics simulations and compare our results to recent XAS experiments performed at the EIS-TIMEX and Fermi beamlines. In particular, we observe in our simulations s ignificant changes in the electronic density of states upon laser excitation. These changes are consistent with the time-evolution of the absoprtion spectrum in experiments. We demonstrate that the changes of the electronic density of states are caused by a non-thermal melting of the system. This can be particularly observed in the time-evolution of the radial distribution function and the mean square displacements.