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Thomas Pohl

Relaxation to nonequilibrium in expanding ultracold neutral plasmas

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We investigate the strongly correlated ion dynamics and the degree of coupling achievable in the evolution of freely expanding ultracold neutral plasmas. We demonstrate that the ionic Coulomb coupling parameter Gamma(i) increases considerably in later stages of the expansion, reaching the strongly coupled regime despite the well known initial drop of Gamma(i) to order unity due to disorder-induced heating. Furthermore, we formulate a suitable measure of correlation and show that Gamma(i) calculated from the ionic temperature and density reflects the degree of order in the system if it is sufficiently close to a quasisteady state. At later times, however, the expansion of the plasma cloud becomes faster than the relaxation of correlations, and the system does not reach thermodynamic equilibrium anymore.

Original languageEnglish
Article number205003
JournalPhysical Review Letters
Volume94
Issue20
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 27 May 2005

    Research areas

  • MOLECULAR-DYNAMICS, RYDBERG ATOMS, EXPANSION

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