Probability of metastable configurations in spherical three-dimensional Yukawa crystals

H. Kählert, P. Ludwig, H. Baumgartner, M. Bonitz, D. Block, S. Käding, A. Melzer, and A. Piel
Phys. Rev. E 78, 036408 – Published 19 September 2008

Abstract

Recently the occurrence probabilities of ground and metastable states of three-dimensional Yukawa clusters with 27 and 31 particles have been analyzed in dusty plasma experiments [D. Block et al., Phys. Plasmas 15, 040701 (2008)]. There it was found that, in many cases, the ground state appeared substantially less frequently than excited states. Here we analyze this question theoretically by means of molecular dynamics (MD) and Monte Carlo simulations and an analytical method based on the canonical partition function. We confirm that metastable states can occur with a significantly higher probability than the ground state. The results strongly depend on the screening parameter of the Yukawa interaction and the damping coefficient used in the MD simulations. The analytical method allows one to gain insight into the mechanisms being responsible for the occurrence probabilities of metastable states in strongly correlated finite systems.

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  • Received 29 May 2008

DOI:https://doi.org/10.1103/PhysRevE.78.036408

©2008 American Physical Society

Authors & Affiliations

H. Kählert1, P. Ludwig1, H. Baumgartner1, M. Bonitz1, D. Block2, S. Käding3, A. Melzer3, and A. Piel2

  • 1Institut für Theoretische Physik und Astrophysik, Christian-Albrechts Universität zu Kiel, 24098 Kiel, Germany
  • 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts Universität zu Kiel, 24098 Kiel, Germany
  • 3Institut für Physik, Ernst-Moritz-Arndt Universität, 17487 Greifswald, Germany

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Vol. 78, Iss. 3 — September 2008

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