Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.20: Poster

Mittwoch, 16. März 2011, 17:15–18:45, P5

Interaction of ultrashort XUV pulses with bulk magnesium — •Naira Grigoryan, Fairoja Cheenicode Kabeer, Eeuwe S. Zijlstra, and Martin E. Garcia — Theoretische Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

A recently published experimental work (Nagler et al.) shows that the excitation of a material with very intense femtosecond XUV pulses first leads to an exotic state characterized by a very high density of core holes (about 1 core hole per atom) and relatively warm electrons. The next step is the formation of warm dense matter. In this work we perform all-electron ab-initio calculations to determine the main pathways from solid to warm dense magnesium. We simulate the XUV excitation by constructing a state with hot electrons and core holes. By analyzing particular optical and acoustic phonon modes at high symmetry points of the Brillouin zone in the highly excited electronic state as a function of the electronic temperature and the number of core holes we obtain an indication of the atomic pathways involved in the first stages of the formation of warm dense matter.