Spin transport in polaronic and superfluid Fermi gases
Name
Sommer-2011-Spin transport in polaronic and superfluid Fermi gases.pdf
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780.43 KB
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Checksum (MD5)
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Author(s)
Sommer, Ariel Tjodolv
Zwierlein, Martin Wolfram
Ku, Mark J. H.
Date Issued
May 2011
Journal
New Journal of Physics
Publisher
Institute of Physics Publishing
Citation
Sommer, Ariel, Mark Ku, and Martin W Zwierlein. “Spin Transport in Polaronic and Superfluid Fermi Gases.” New Journal of Physics 13.5 (2011): 055009. Web.
Version
Final published version
Abstract
We present measurements of spin transport in ultracold gases of fermionic 6Li in a mixture of two spin states at a Feshbach resonance. In particular, we study the spin-dipole mode, where the two spin components are displaced from each other against a harmonic restoring force. We prepare a highly imbalanced, or polaronic, spin mixture with a spin-dipole excitation and we observe strong, unitarity-limited damping of the spin-dipole mode. In gases with small spin imbalance, below the Pauli limit for superfluidity, we observe strongly damped spin flow even in the presence of a superfluid core. This indicates strong mutual friction between superfluid and polarized normal spins, possibly involving Andreev reflection at the superfluid–normal interface.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
MIT-Harvard Center for Ultracold Atoms
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1088/1367-2630/13/5/055009
