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Published Online July 22, 2004
Science DOI: 10.1126/science.1100782

Reports

Submitted on May 26, 2004
Accepted on July 13, 2004

Pairing Gap and In-Gap Excitations in Trapped Fermionic Superfluids

J. Kinnunen 1, M. Rodríguez 1, P. Törmä 1*

1 Department of Physics, NanoScience Center, P.O.Box 35, FIN-40014 University of Jyväskylä, Finland.

* To whom correspondence should be addressed.
P. Törmä , E-mail: paivi.torma{at}phys.jyu.fi

We consider trapped atomic Fermi gases with Feshbach-resonance enhanced interactions in pseudogap and superfluid temperatures. We calculate the spectrum of RF (or laser) excitations for transitions that transfer atoms out of the superfluid state. The spectrum displays the pairing gap and also the contribution of unpaired atoms, i.e. in-gap excitations. The results support the conclusion that a superfluid, where pairing is a many-body effect, was observed in recent experiments on RF spectroscopy of the pairing gap.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)