Bose Gases Near Unitarity

Details Bose Gases Near Unitarity Bose Gases Near Unitarity

2012-01-10

arxiv.org/abs/1201.1958v3

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

We study the properties of strongly interacting Bose gases at the density and temperature regime when the three-body recombination rate is substantially reduced. In this regime, one can have a Bose gas with all particles in scattering states (i.e. the "upper branch") with little loss even at unitarity over the duration of the experiment. We show that because of bosonic enhancement, pair formation is shifted to the atomic side of the original resonance (where scattering length $a_s<0$), opposite to the fermionic case. In a trap, a repulsive Bose gas remains mechanically stable when brought across resonance to the atomic side until it reaches a critical scattering length $a_{s}^{\ast}<0$. For $a_s

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