Analysis of the ordering transition of hard disks through the Mayer cluster expansion

Details Analysis of the ordering transition of hard disks through the Mayer cluster expansion Analysis of the ordering transition of hard disks through the Mayer cluster expansion

2005-09-12

arxiv.org/abs/cond-mat/0509299v1

Phys. Rev. E 73, 025104 (RC) (2006)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.73.025104

The available virial coefficients for the 2D hard disks model are transformed into a matrix representation of the thermodynamic potentials, which allows for an accurate description of the whole fluid phase, up to the phase transition. We find that the fluid phase terminates at the transition point, supporting the Kosterlitz-Thouless-Halperin-Nelson-Young picture of a second order phase transition into a Hexatic phase. The density and pressure at the transition are calculated from the available first ten virial coefficients, and are found to be in excellent agreement with recent Monte-Carlo calculations. Finally, we calculate the equation of state in the critical region.

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