Momentum distribution of an interacting Bose-Einstein condensed gas at finite temperature
Anna Minguzzi, Patrizia Vignolo, Mario P. Tosi
We use a semiclassical two-fluid model to study the momentum distribution of a Bose-Einstein condensed gas with repulsive interactions inside a harmonic trap at finite temperature, with specific focus on atomic hydrogen. We give particular attention to the average kinetic energy, which is almost entirely associated with the thermal cloud. A nonlinear dependence of the kinetic energy on temperature is displayed, affording a precise way to assess the temperature of the gas. We also show that the kinetic energy increases with the strength of the interactions, reflecting an enhanced rate of depletion of the condensate with increasing temperature.
arXiv:cond-mat/0003110•Physical Review A•Jul 17, 2000•10 citations