High Temperature Expansion Applied to Fermions near Feshbach Resonance

Tin-Lun Ho and Erich J. Mueller
Phys. Rev. Lett. 92, 160404 – Published 20 April 2004

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.

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  • Received 4 August 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.160404

©2004 American Physical Society

Authors & Affiliations

Tin-Lun Ho1 and Erich J. Mueller2

  • 1Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
  • 2Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA

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Issue

Vol. 92, Iss. 16 — 23 April 2004

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