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APS » Journals » Phys. Rev. Lett. » Volume 99 » Issue 19
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Phys. Rev. Lett. 99, 190407 (2007) [4 pages]

Coherence and Clock Shifts in Ultracold Fermi Gases with Resonant Interactions

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Gordon Baym1,2, C. J. Pethick2,3, Zhenhua Yu1, and Martin W. Zwierlein4,5
1Department of Physics, University of Illinois, 1110 W. Green Street, Urbana, Illinois 61801, USA
2The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
3NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
4MIT-Harvard Center for Ultracold Atoms, Research Laboratory for Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
5Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany

Received 5 July 2007; published 8 November 2007

Using arguments based on sum rules, we derive a general result for the average shifts of rf lines in Fermi gases in terms of interatomic interaction strengths and two-particle correlation functions. We show that near an interaction resonance shifts vary inversely with the atomic scattering length, rather than linearly as in dilute gases, thus accounting for the experimental observation that clock shifts remain finite at Feshbach resonances.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.190407
DOI:
10.1103/PhysRevLett.99.190407
PACS:
05.30.Fk, 03.75.Hh, 67.40.Db, 67.40.Vs
 
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