Spinodal decomposition in polarised Fermi superfluids

Details Spinodal decomposition in polarised Fermi superfluids Spinodal decomposition in polarised Fermi superfluids

2007-01-28

arxiv.org/abs/cond-mat/0701692v2

Phys. Rev. B 77, 014511 (2008)

Physics

Condensed Matter

Superconductivity

6 pages, 3 eps figures (published version)

Scientific paper

10.1103/PhysRevB.77.014511

We discuss the dynamics of phase separation through the process of spinodal decomposition in a Fermi superfluid with population imbalance. We discuss this instability first in terms of a phenomenological Landau theory. Working within the mean-field description at zero temperature, we then find the spinodal region in the phase diagram of polarisation versus interaction strength, and the spectrum of unstable modes in this region. After a quench, the spinodal decomposition starts from the Sarma state, which is a minimum of the free energy with respect to the order parameter at fixed density and polarisation and a maximum at fixed chemical potentials. The possibility of observing non-trivial domain structures in current experiments with trapped atomic gases is discussed.

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