Bose condensation for attractive interaction?


Bose condensation for attractive interaction?

Maennel, M.; Lipavský, P.; Morawetz, K.; Schreiber, M.

We investigate an interacting Bose gas using a scheme to eliminate successive collisions. For attractive interaction we find a two-particle bound state. When the binding energy of this bound state becomes twice the chemical potential there is a second order phase transition and a gap appears in the dispersion relation. The gap decreases with increasing density. At the critical point the gap vanishes, the dispersion becomes linear for small momenta and a Bose condensate appears. We interpret the appearance of the gap as a sign of structure formation.

  • Poster
    International Workshop on Nonequilibrium Nanostructures, 01.-06.12.2008, Dresden, Germany

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Publ.-Id: 12105