Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Poster I

A 15.58: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Collective modes in ultracold plasma — •Andrii Liubonko, Thomas Pohl, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany

Ultracold neutral plasmas (UCP) are formed by photoionizing laser cooled atoms near the ionization threshold [1,2]. The electron temperature is from 1-1000K and the ion temperature is around 1K. The fundamental interest in these systems originates in the possibility of creating strongly coupled plasma. Recently, a series of collective modes of an UCP were observed in the experiment [3]. Numerical simulations of this effect within molecular dynamics will be presented. The results show that collective modes in an UCP, previously identified with Tonks-Dattner resonances, have a different nature, which stems from the fact, that UCP is not confined. Existing theory based on cold plasma theory does not provide an explanation of these resonances. We extend the theory to the finite temperature. Possible approaches to cope with this problem will be discussed.

1.T. C. Killian, Science 316, 705 (2007). 2.T.C. Killian, T. Pattard, T. Pohl, J.M. Rost, Phys.Rep. 449 (2007). 3.R. S. Fletcher, X. L. Zhang, and S. L. Rolston, Phys. Rev. Lett., 96:105003 (2006).