Metastability in Spin-Polarized Fermi Gases

Abstract

We study the role of particle transport and evaporation on the phase separation of an ultracold, spin-polarized atomic Fermi gas. We show that the previously observed deformation of the superfluid paired core is a result of evaporative depolarization of the superfluid due to a combination of enhanced evaporation at the center of the trap and the inhibition of spin transport at the normal-superfluid phase boundary. These factors contribute to a nonequilibrium jump in the chemical potentials at the phase boundary. Once formed, the deformed state is highly metastable, persisting for times of up to 2ᅠs.

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Liao, Y.A., Revelle, M., Paprotta, T., et al.. "Metastability in Spin-Polarized Fermi Gases." Physical Review Letters, 107, no. 14 (2011) American Physical Society: 145305. http://dx.doi.org/10.1103/PhysRevLett.107.145305.

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