A Testbench for the Nested Dipole Hypothesis of Kosterlitz and Thouless

Details A Testbench for the Nested Dipole Hypothesis of Kosterlitz and Thouless A Testbench for the Nested Dipole Hypothesis of Kosterlitz and Thouless

1995-05-03

arxiv.org/abs/cond-mat/9505014v1

Physics

Condensed Matter

19 pages, 2 figures (1 not included), Latex, to appear J. Stat. Phys

Scientific paper

10.1007/BF02184869

We consider the two-dimensional one-component plasma without a background and confined to a half plane near a metal wall. The particles are also subjected to an external potential acting perpendicular to the wall with an inverse power law Boltzmann factor. The model has a known solvable isotherm which exhibits a Kosterlitz-Thouless type transition from a conductive to an insulator phase as the power law is varied. This allows predictions of theoretical methods of analysing the Kosterlitz-Thouless transition to be compared with the exact solution. In particular we calculate the asymptotic density profile by resumming its low fugacity expansion near the zero-density critical coupling in the insulator phase, and solving a mean-field equation deduced from the first BGY equation. Agreement with the exact solution is obtained. As the former calculation makes essential use of the nested dipole hypothesis of Kosterlitz and Thouless, the validity of this hypothesis is explicitly verified.

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