title: Competition between pairing and ferromagnetic instabilities in ultracold Fermi gases near Feshbach resonances.
abstract: 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.
authors.affiliation: Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: David
authors.initials: D
authors.lastname: Pekker
authors.forename: Mehrtash
authors.initials: M
authors.lastname: Babadi
authors.forename: Rajdeep
authors.initials: R
authors.lastname: Sensarma
authors.forename: Nikolaj
authors.initials: N
authors.lastname: Zinner
authors.forename: Lode
authors.initials: L
authors.lastname: Pollet
authors.forename: Martin W
authors.initials: MW
authors.lastname: Zwierlein
authors.forename: Eugene
authors.initials: E
authors.lastname: Demler