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Originally published in Science Express on 22 July 2004
Science 20 August 2004:
Vol. 305. no. 5687, pp. 1131 - 1133
DOI: 10.1126/science.1100782
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Reports

Pairing Gap and In-Gap Excitations in Trapped Fermionic Superfluids

J. Kinnunen, M. Rodríguez, P. Törmä*

We consider trapped atomic Fermi gases with Feshbach-resonance enhanced interactions in pseudogap and superfluid temperatures. We calculate the spectrum of radio-frequency (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, that is, in-gap excitations. The results support the conclusion that a superfluid, in which pairing is a manybody effect, was observed in recent experiments on radio-frequency spectroscopy of the pairing gap.

Department of Physics, NanoScience Center, Post Office Box 35, FIN-40014, University of Jyväskylä, Finland.

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

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