Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 13: Poster I - Ultra-cold plasmas and Rydberg systems

A 13.4: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster B

Collective modes in Ultracold Plasmas — •Andrey Lyubonko and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden

Ultracold plasmas (UCP) are relatively new physical systems which have been intensively studied since 1999 [1]. The possibility of creation of finely controlled strongly coupled Coulomb systems on the basis of UCP is one of the motivations. A new feature of UCP was observed recently namely the existence of electronic collective modes (Tonks-Dattner resonances) [2]. Beyond fundamental interest such modes may provide an accurate method to determine the time-dependent electron temperature of UCP.

The first two moments of the collisionless Boltzmann equation assuming a scalar pressure are used to describe the collective modes in UCP. The similar hydrodynamical model was successfully applied to Tonks-Dattner resonances in hot plasma in the past [3] . We will present the results of a similar approach for the resonances in UCP incorporating the additional complication of the finite size of an UCP.

[1] T. C. Killian, S. Kulin, S. D. Bergeson, L. A. Orozco, C. Orzel, and S. L. Rolston, Phys. Rev. Lett., 83(23):4776 (1999)

[2] R. S. Fletcher, X. L. Zhang, and S. L. Rolston, Phys. Rev. Lett., 96:105003 (2006)

[3] J.V. Parker, J.C. Nickel, and R. W. Gould, Phys. Fluids 7, 1489 (1964).

[4] T.C. Killian, T. Pohl, T. Pattard and J M Rost, Physics Reports submitted, (2006), http://arxiv.org/pdf/physics/0612097