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

E. Strepparola·A. Minguzzi·M. P. Tosi
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Abstract

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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E. Strepparola, A. Minguzzi, M. P. Tosi. 2000-12-11. Quasicondensate and superfluid fraction in the 2D charged-boson gas at finite temperature. https://doi.org/10.1103/physrevb.63.104509

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