Surface correlations for two-dimensional Coulomb fluids in a disc

Details Surface correlations for two-dimensional Coulomb fluids in a disc Surface correlations for two-dimensional Coulomb fluids in a disc

2002-04-16

arxiv.org/abs/cond-mat/0204338v1

J.Phys.:Condens.Matter, 14 (2002) 9121

Physics

Condensed Matter

Statistical Mechanics

15 pages, Latex, submitted to J.Phys.:Condens.Matter

Scientific paper

10.1088/0953-8984/14/40/306

After a brief review of previous work, two exactly solvable two-dimensional models of a finite Coulomb fluid in a disc are studied. The charge correlation function near the boundary circle is computed. When the disc radius is large compared to the bulk correlation length, a correlation function of the surface charge density can be defined. It is checked, on the solvable models, that this correlation function does have the generic long-range behaviour, decaying as the inverse square distance, predicted by macroscopic electrostatics. In the case of a two-component plasma (Coulomb fluid made of two species of particles of opposite charges), the density correlation function on the boundary circle itself is conjectured to have a temperature-independent behaviour, decaying as the -4 power of the distance.

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