Stability of Bosonic atomic and molecular condensates near a Feshbach resonance

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We explore the Bose condensed phases of an atomic gas on the molecular side of a Feshbach resonance. In the absence of atom-molecule and molecule-molecule scattering, we show that the atomic condensate is either a saddle point of the free energy with energy always exceeding that of the molecular condensate, or has a negative compressibility (hence unstable to density fluctuations). Therefore no phase transition occurs between the atomic and molecular condensates. We also show that a repulsive molecule-molecule scattering can stabilize a sufficiently dense atomic condensate, leading to the possibility of a phase transition. We caution that 3-body processes may render this transition unobservable.
4 pages, 2 figures

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Other Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/101650

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0507460
 http://arxiv.org/abs/cond-mat/0507460

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arXiv