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Superfluidity in a gas of strongly interacting fermions

Author(s)
Schunk, C. H.; Shin, Y.; Schirotzek, Andre; Ketterle, Wolfgang
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
After an introduction into 100 years of research on superfluidity and the concept of the BCS–BEC crossover, we describe recent experimental studies of a spin-polarized Fermi gas with strong interactions. Tomographically resolving the spatial structure of an inhomogeneous trapped sample, we have mapped out the superfluid phases in the parameter space of temperature, spin polarization, and interaction strength. Phase separation between the superfluid and the normal component occurs at low temperatures, showing spatial discontinuities in the spin polarization. The critical polarization of the normal gas increases with stronger coupling. Beyond a critical interaction strength all minority atoms pair with majority atoms, and the system can be effectively described as a boson–fermion mixture. Pairing correlations have been studied by rf spectroscopy, determining the fermion pair size and the pairing gap energy in a resonantly interacting superfluid.
Date issued
2009-03
URI
http://hdl.handle.net/1721.1/51361
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Journal of Physics: Condensed Matter
Publisher
Institute of Physics Publishing
Citation
Ketterle, W. et al. “Superfluidity in a gas of strongly interacting fermions.” Journal of Physics: Condensed Matter 21.16 (2009): 164206.
Version: Author's final manuscript
ISSN
0953-8984

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