Strong-Coupling Theory for Counter-Ion Distributions

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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7 pages, 3 figures; to appear in Europhys. Lett

Scientific paper

10.1209/epl/i2000-00495-1

The Poisson-Boltzmann approach gives asymptotically exact counter-ion density profiles around charged objects in the weak-coupling limit of low valency and high temperature. In this paper we derive, using field-theoretic methods, a theory which becomes exact in the opposite limit of strong coupling. Formally, it corresponds to a standard virial expansion. Long-range divergences, which render the virial expansion intractable for homogeneous bulk systems, are shown to be renormalizable for the case of inhomogeneous distribution functions by a systematic expansion in inverse powers of the coupling parameter. For a planar charged wall, our analytical results compare quantitatively with extensive Monte-Carlo simulations.

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