Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-12-10
Phys. Rev. B 71, 085112 (2005)
Physics
Condensed Matter
Statistical Mechanics
15 pages, 16 figures
Scientific paper
10.1103/PhysRevB.71.085112
The existence of a discontinuity in the inverse dielectric constant of the two-dimensional Coulomb gas is demonstrated on purely numerical grounds. This is done by expanding the free energy in an applied twist and performing a finite-size scaling analysis of the coefficients of higher-order terms. The phase transition, driven by unbinding of dipoles, corresponds to the Kosterlitz-Thouless transition in the 2D XY model. The method developed is also used for investigating the possibility of a Kosterlitz-Thouless phase transition in a three-dimensional system of point charges interacting with a logarithmic pair-potential, a system related to effective theories of low-dimensional strongly correlated systems. We also contrast the finite-size scaling of the fluctuations of the dipole moments of the two-dimensional Coulomb gas and the three-dimensional logarithmic system to those of the three-dimensional Coulomb gas.
Borkje Kjetil
Kragset Steinar
Sudbo Asle
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