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P: Plasmaphysik

P 22: Staubige Plasmen 1

P 22.4: Talk

Wednesday, March 29, 2006, 12:00–12:15, 1004

Theory of screened Coulomb balls — •Volodymyr Golubnychiy, Henning Baumgartner, Alexei Filinov, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, D-24098 Kiel

We give an overview on theoretical and first-principle computer simulation (Molecular dynamics and Monte-Carlo) results for spherical dust particle clusters (Coulomb balls) [1]. The recently proposed theoretical models [2-4] are discussed. It is demonstrated that the model of static screening with a constant parabolic confinement allows for a consistent explanation of the experimental results [4], in contrast to the model of selfconfinement of Ref.[2]. Furthermore, analytical results for the screening dependence of the cluster size, distance fluctuations, stability and melting behavior are presented. In particular, it is demonstrated that screening destabilizes the Coulomb balls.

[1] O. Arp, D. Block, A. Melzer and A. Piel, Phys. Rev. Lett. 93 165004 (2004)

[2] H. Totsuji, T. Ogawa, C. Totsuji and K. Tsuruta, Phys. Rev. E 72 036406 (2005)

[3] Z. Chen, M.Y. Yu and H. Luo, Physica Scripta 71, 638-643 (2005)

[4] M. Bonitz, D. Block, O. Arp, V. Golubnychiy, H. Baumgartner, P. Ludwig, A. Piel and A. Filinov, submitted to Phys. Rev. Lett., preprint at ArXiv: physics/0508212