Spin transport in polaronic and superfluid Fermi gases
Author(s)Sommer, Ariel Tjodolv; Zwierlein, Martin Wolfram; Ku, Mark J. H.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
New Journal of Physics
Institute of Physics Publishing
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.
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