Coherence and Clock Shifts in Ultracold Fermi Gases with Resonant Interactions

Journal Article · Thu Nov 08 23:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.190407· OSTI ID:21024402

Baym, Gordon ^[1]; Pethick, C J ^[2]; Zhenhua, Yu ^[1]; Zwierlein, Martin W ^[3]

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1. Department of Physics, University of Illinois, 1110 W. Green Street, Urbana, Illinois 61801 (United States)
2. Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen O (Denmark)
3. MIT-Harvard Center for Ultracold Atoms, Research Laboratory for Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

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.

• OSTI ID: 21024402
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATION FUNCTIONS
FERMI GAS
INTERACTIONS
RESONANCE
SCATTERING LENGTHS
SUM RULES