Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 4: Theory of Quantum Plasmas I

P 4.2: Vortrag

Montag, 17. März 2014, 14:30–14:45, SPA HS202

Structural dynamics of warm dense noble metals — •Fairoja Cheenicode Kabeer, Eeuwe S. Zijlstra, and Martin E. Garcia — Theoretical Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132-Kassel, Germany.

The dynamical structural evolution of warm dense noble metals immediately following the intense extreme ultra-violet (XUV) optical excitations is important to understand the transition from warm dense matter to an ideal plasma state microscopically. In particular, so far, it is unknown, whether this transition occurs via thermal equilibration of hot electrons and cold atoms or nonthermally in the presence of hot electrons and cold atoms. Here we used density functional theory to compute the response of the phonon spectra of copper and silver in the presence of a core hole, with hot and cold electrons. We found that the average interatomic bonds become stronger in the warm dense state of both noble metals. The implications of this finding for the relaxation dynamics of warm dense matter to the plasma state are discussed.