Düsseldorf 2007 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 6: Grundlegende Probleme, Theorie

P 6.3: Vortrag

Montag, 19. März 2007, 15:15–15:30, 6F

Thermodynamic theory of a strongly correlated confined Yukawa plasma — •Christian Henning, Michael Bonitz, and Alexei Filinov — CAU zu Kiel, ITAP, D-24118 Kiel

The structure of ``Yukawa balls", i.e. spherical 3D dust crystals, which recently have been produced at room temperature [1], is well explained by computer simulations of charged Yukawa interacting particles within an external parabolic confinement [2]. However, an analytical theory is still missing. Here we present first results of a systematic statistical theory of strongly correlated confined Yukawa plasmas based upon a continuum approach. In particular, mean-field and correlation contributions are analyzed. The results range from the ground state density profile [3, 4] to the equation of state and also allow to relate short range and long range interactions due to variation of the screening parameter. Furthermore, we compare the results to molecular dynamics simulations and to shell models as well showing that an excellent agreement to the crystalline structure is found. Finally the extension to finite temperature is presented.

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

[2] M. Bonitz, D. Block, O. Arp, V. Golubnychiy, H. Baumgartner, P. Ludwig, A. Piel, and A. Filinov, Phys. Rev. Lett. 96, 075001 (2006)

[3] C. Henning, H. Baumgartner, A. Piel, P. Ludwig, V. Golubnichiy, M. Bonitz, and D. Block, Phys. Rev. E 74, 056403 (2006)

[4] C. Henning, M. Bonitz, and A. Filinov, submitted for publication