Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances

Details Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances

2010-05-13

arxiv.org/abs/1005.2366v1

Phys. Rev. Lett. 106, 050402 (2011)

Physics

Condensed Matter

Quantum Gases

4+epsilon pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.050402

We study the quench dynamics of a two-component ultracold Fermi gas from the weak into the strong interaction regime, where the short time dynamics are governed by the exponential growth rate of unstable collective modes. We obtain an effective interaction that takes into account both Pauli blocking and the energy dependence of the scattering amplitude near a Feshbach resonance. Using this interaction we analyze the competing instabilities towards Stoner ferromagnetism and pairing.

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