High temperature expansion applied to fermions near Feshbach resonance

Details High temperature expansion applied to fermions near Feshbach resonance High temperature expansion applied to fermions near Feshbach resonance

2003-06-06

arxiv.org/abs/cond-mat/0306187v4

Phys.Rev.Lett.92:160404,2004

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures (3 color, 1 BW), RevTeX4; ver4 -- updated references, changed title -- version accepted for publication in

Scientific paper

10.1103/PhysRevLett.92.160404

We show that, apart from a difference in scale, all of the surprising recently observed properties of a degenerate Fermi gas near a Feshbach resonance persist in the high temperature Boltzmann regime. In this regime, the Feshbach resonance is unshifted. By sweeping across the resonance, a thermal distribution of bound states (molecules) can be reversibly generated. Throughout this process, the interaction energy is negative and continuous. We also show that this behavior must persist at lower temperatures unless there is a phase transition as the temperature is lowered. We rigorously demonstrate universal behavior near the resonance.

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