Quasicondensate and superfluid fraction in the 2D charged-boson gas at finite temperature

Details Quasicondensate and superfluid fraction in the 2D charged-boson gas at finite temperature Quasicondensate and superfluid fraction in the 2D charged-boson gas at finite temperature

2000-12-11

arxiv.org/abs/cond-mat/0012171v1

Phys. Rev. B 63, 104509 (2001)

Physics

Condensed Matter

9 pages, 2 figures

Scientific paper

10.1103/PhysRevB.63.104509

The Bogoliubov - de Gennes equations are solved for the Coulomb Bose gas describing a fluid of charged bosons at finite temperature. The approach is applicable in the weak coupling regime and the extent of its quantitative usefulness is tested in the three-dimensional fluid, for which diffusion Monte Carlo data are available on the condensate fraction at zero temperature. The one-body density matrix is then evaluated by the same approach for the two-dimensional fluid with e^2/r interactions, to demonstrate the presence of a quasi-condensate from its power-law decay with increasing distance and to evaluate the superfluid fraction as a function of temperature at weak coupling.

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