Structure and melting of two-species charged clusters in a parabolic trap

We consider a system of charged particles interacting with an unscreened Coulomb repulsion in a two-dimensional parabolic confining trap. The static charge on a portion of the particles is twice as large as the charge on the remaining particles. The particles separate into a shell structure with tho...

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Veröffentlicht in:Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics Statistical physics, plasmas, fluids, and related interdisciplinary topics, 2003-12, Vol.68 (6 Pt 1), p.060401-060401, Article 060401
Hauptverfasser: Drocco, J A, Reichhardt, C J Olson, Reichhardt, C, Jankó, B
Format: Artikel
Sprache:eng
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Zusammenfassung:We consider a system of charged particles interacting with an unscreened Coulomb repulsion in a two-dimensional parabolic confining trap. The static charge on a portion of the particles is twice as large as the charge on the remaining particles. The particles separate into a shell structure with those of greater charge situated farther from the center of the trap. As we vary the ratio of the number of particles of the two species, we find that for certain configurations, the symmetry of the arrangement of the inner cluster of singly charged particles matches the symmetry of the outer ring of doubly charged particles. These matching configurations have a higher melting temperature and a higher thermal threshold for intershell rotation between the species than the nonmatching configurations.
ISSN:1539-3755
1063-651X
1095-3787
DOI:10.1103/PhysRevE.68.060401