Second order quantum phase transition of a homogeneous Bose gas with attractive interactions

Details Second order quantum phase transition of a homogeneous Bose gas with attractive interactions Second order quantum phase transition of a homogeneous Bose gas with attractive interactions

2008-04-02

arxiv.org/abs/0804.0364v1

Physics

Condensed Matter

Other Condensed Matter

7 pages, 3 figures

Scientific paper

10.1103/PhysRevA.78.023620

We consider a homogeneous Bose gas of particles with an attractive interaction. Mean field theory predicts for this system a spontaneous symmetry breaking at a certain value of the interaction strength. We show that at this point a second-order quantum phase transition occurs. We investigate the system in the vicinity of the critical point using Bogoliubov theory and a continuous description, that allows us to analyze {\it quantum fluctuations} in the system even when the Bogoliubov approach breaks down.

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