Thermodynamic Properties of the One-Dimensional Two-Component Log-Gas

Details Thermodynamic Properties of the One-Dimensional Two-Component Log-Gas Thermodynamic Properties of the One-Dimensional Two-Component Log-Gas

2001-02-19

arxiv.org/abs/cond-mat/0102332v1

J. Stat. Phys. 105 (2001) 175-193

Physics

Condensed Matter

Statistical Mechanics

22 pages, Latex

Scientific paper

We consider a one-dimensional continuum gas of pointlike positive and negative unit charges interacting via a logarithmic potential. The mapping onto a two-dimensional boundary sine-Gordon field theory with zero bulk mass provides the full thermodynamics (density-fugacity relationship, specific heat, etc.) of the log-gas in the whole stability range of inverse temperatures $\beta<1$. An exact formula for the excess chemical potential of a ``foreign'' particle of an arbitrary charge, put into the log-gas, is derived. The results are checked by a small-$\beta$ expansion and at the collapse $\beta=1$ point. The possibility to go beyond the collapse temperature is discussed.

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