Physics – Condensed Matter
Scientific paper
1997-02-14
Physics
Condensed Matter
5 pages, Revtex with twocolumn style, 2 Postscript figures. Submitted to PRL
Scientific paper
10.1103/PhysRevE.56.619
Sine-Gordon field theory is used to investigate the phase diagram of a neutral Coulomb gas. A variational mean field free energy is constructed and the corresponding phase diagrams in two (2d) and three dimensions (3d) are obtained. When analyzed in terms of chemical potential, the Sine-Gordon theory predicts the phase diagram topologically identical with the Monte Carlo simulations and a recently developed Debye-H\"uckel-Bjerrum (DHBj) theory. In 2d we find that the infinite order Kosterlitz-Thouless line terminates in a tricritical point, after which the metal-insulator transition becomes first order. However, when the transformation from chemical potential to the density is made the whole of the insulating phase is mapped onto zero density.
Barbosa Marcia C.
Diehl Alexandre
Levin Yan
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