Quantum Phase Diagram for Homogeneous Bose-Einstein Condensate

Details Quantum Phase Diagram for Homogeneous Bose-Einstein Condensate Quantum Phase Diagram for Homogeneous Bose-Einstein Condensate

2003-08-27

arxiv.org/abs/cond-mat/0308561v1

Annalen der Physik (Leipzig) 14, 214-230 (2005)

Physics

Condensed Matter

Author Information under http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of paper (including all P

Scientific paper

We calculate the quantum phase transition for a homogeneous Bose gas in the plane of s-wave scattering length a_s and temperature T. This is done by improving a one-loop result near the interaction-free Bose-Einstein critical temperature T_c^{(0)} with the help of recent high-loop results on the shift of the critical temperature due to a weak atomic repulsion using variational perturbation theory. The quantum phase diagram shows a nose above T_c^{(0)}, so that we predict the existence of a reentrant transition above T_c^{(0)}, where an increasing repulsion leads to the formation of a condensate.

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