High temperature expansion applied to fermions near Feshbach resonance

Preprint

23 February 2004

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0306187

Abstract

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.

Keywords

TEMPERATURE EXPANSION
FESHBACH RESONANCE
EXPANSION APPLIED
PHASE TRANSITION
HIGH TEMPERATURE
BEHAVIOR
FERMIONS
PERSIST

All Related Versions

Version 1, 2003-06-06, ArXiv
Version 2, 2003-06-22, ArXiv
Version 3, 2003-08-05, ArXiv
Version 4, 2004-02-23, ArXiv
Published version: Physical Review Letters, 92 (16), 160404.

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