Fermi-Bose Correspondence and Bose-Einstein Condensation in The Two-Dimensional Ideal Gas

Details Fermi-Bose Correspondence and Bose-Einstein Condensation in The Two-Dimensional Ideal Gas Fermi-Bose Correspondence and Bose-Einstein Condensation in The Two-Dimensional Ideal Gas

2003-10-04

arxiv.org/abs/cond-mat/0310083v1

Physics

Condensed Matter

Statistical Mechanics

18 pages, 3 figures in EPS format, to be published in Journal of Low Temperature Physics

Scientific paper

10.1023/B:JOLT.0000013207.24358.

The ideal uniform two-dimensional (2D) Fermi and Bose gases are considered both in the thermodynamic limit and the finite case. We derive May's Theorem, viz. the correspondence between the internal energies of the Fermi and Bose gases in the thermodynamic limit. This results in both gases having the same heat capacity. However, as we shall show, the thermodynamic limit is never truly reached in two dimensions and so it is essential to consider finite-size effects. We show in an elementary manner that for the finite 2D Bose gas, a pseudo-Bose-Einstein condensate forms at low temperatures, incompatible with May's Theorem. The two gases now have different heat capacities, dependent on the system size and tending to the same expression in the thermodynamic limit.

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