On phases in weakly interacting finite Bose systems
arXiv:cond-mat/0107613 · doi:10.1103/PhysRevA.65.043603
Abstract
We study precursors of thermal phase transitions in finite systems of interacting Bose gases. For weakly repulsive interactions there is a phase transition to the one-vortex state. The distribution of zeros of the partition function indicates that this transition is first order, and the precursors of the phase transition are already displayed in systems of a few dozen bosons. Systems of this size do not exhibit new phases as more vortices are added to the system.
7 pages, 2 figures