Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 86: Plasmonics and Nanooptics VI

O 86.1: Talk

Friday, March 15, 2013, 10:30–10:45, H36

Modelling attosecond dynamics: tracking collective excitations — •Andrey Moskalenko, Yaroslav Pavlyukh, Jonas Wätzel, and Jamal Berakdar — Institut für Physik, Martin-Luther-Universität Halle-Wittenberg

The emergence of attosecond light sources is undoubtedly one of most exciting developments in science in the last decade and is expected to change significantly the face of physics, chemistry and biology research. A series of benchmark experiments on the attosecond electron dynamics in atomic, molecular and condensed matter systems reveal fundamentally new processes taking place in this time regime and evidence the high potential of this rapidly growing field. One of the fundamental open questions, which can be targeted with these new experimental tools, is how an inherent collective response of matter is formed on an ultrashort, possibly attosecond time scale. In this presentation we report on our progress towards modelling attosecond electron dynamics in clusters. Combining quantum chemical computation [1] with quantum kinetic methods we calculate the time-dependent light absorption and refraction in fullerene that serve as indicators for the emergence of collective modes. We trace on an attosecond time scale the collective excitations in this finite system and find distinct new features in this regime [2]. Finally, we discuss how to observe the predicted dynamics in a XUV-pump XUV-probe or in an attosecond streaking experiments.

[1] Y. Pavlyukh and J. Berakdar, Chem. Phys. Lett. 468, 313 (2009).

[2] A.S. Moskalenko, Y. Pavlyukh, and J. Berakdar, Phys. Rev. A

86, 013202 (2012).