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Normal-Superfluid Interface Scattering For Polarized Fermion Gases

Bert Van Schaeybroeck·Achilleas Lazarides
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Abstract

We argue that, for the recent experiments with imbalanced fermion gases, a temperature difference may occur between the normal (N) and the gapped superfluid (SF) phase. Using the mean-field formalism, we study particle scattering off the N-SF interface from the deep BCS to the unitary regime. We show that the thermal conductivity across the interface drops exponentially fast with increasing $h/k_B T$, where $h$ is the chemical potential imbalance. This implies a blocking of thermal equilibration between the N and the SF phase. We also provide a possible mechanism for the creation of gap oscillations (FFLO-like states) as seen in recent studies on these systems.

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Bert Van Schaeybroeck, Achilleas Lazarides. 2007-04-30. Normal-Superfluid Interface Scattering For Polarized Fermion Gases. https://doi.org/10.1103/physrevlett.98.170402

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