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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 2
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Phys. Rev. Lett. 91, 020402 (2003) [4 pages]

Measurement of the Interaction Energy near a Feshbach Resonance in a 6Li Fermi Gas

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T.  Bourdel1, J.  Cubizolles1, L.  Khaykovich1, K.  M.  F.  Magalhães1,*, S.  J.  J.  M.  F.  Kokkelmans1, G.  V.  Shlyapnikov1,2,3, and C.  Salomon1
1Laboratoire Kastler Brossel, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris 05, France
2FOM Institute AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
3Russian Research Center Kurchatov Institute, Kurchatov Square, 123182 Moscow, Russia

Received 5 March 2003; published 11 July 2003

We investigate the strongly interacting regime in an optically trapped 6Li Fermi mixture near a Feshbach resonance. The resonance is found at 800(40)   G in good agreement with theory. Anisotropic expansion of the gas is interpreted by collisional hydrodynamics. We observe an unexpected and large shift (80 G) between the resonance peak and both the maximum of atom loss and the change of sign of the interaction energy.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.020402
DOI:
10.1103/PhysRevLett.91.020402
PACS:
03.75.Ss, 05.20.Dd, 05.30.Fk, 32.80.Pj

*Present Address: Instituto de Física de São Carlos-USP, Caixa Postal 369 CEP 13560-970 São Carlos, Brasil.

 
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