Kiel 2011 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Poster: Theorie/Simulation dichter und stark gekoppelter Plasmen
P 18.19: Poster
Mittwoch, 30. März 2011, 16:30–18:30, Foyer
Pair Correlations for Charges in a Harmonic Trap — Jeffrey Wrighton1, James Dufty1, •Hanno Kählert2, Torben Ott2, Patrick Ludwig2, and Michael Bonitz2 — 1Physics Department, University of Florida — 2Institut für Theoretische Physik und Astrophysik*Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel
A classical system of N identical charges in a harmonic trap exhibits both shell structure and orientational ordering due to Coulomb correlations. The shell structure can be reproduced accurately using approximate correlations from the bulk OCP [1]. Here we report additional relationships between correlations in the trap and those for the bulk OCP: 1) pair correlations calculated without reference to their location in the trap agree with those of the bulk OCP. 2) orientational pair correlations among particles within a shell are represented by those of the bulk OCP, when Euclidean distance is replaced by arc length (qualitative agreement using 3D OCP; quantitative agreement using 2D OCP). At stronger coupling, the correlations induce an ordering within the shells (spherical Wigner crystal). It is shown that the orientational correlations for this phase are described by thos for the single sphere Thomson problem, i.e. the Thomson sites represent the "lattice" for the spherical crystal. Finite temperature effects for this phase are described as well. (Research supported by DOE award DE-FG02-07ER54946 and by the Deutsche Forschungsgemeinschaft via SFB-TR24.)
[1] J. Wrighton, J. Dufty, H. Kählert, and M. Bonitz, Phys. Rev. E 80, 038912 (2009), Contrib. Plasma Phys. 50, 26 (2010)