Non-equilibrium dynamics of interacting Fermi systems in quench experiments

Details Non-equilibrium dynamics of interacting Fermi systems in quench experiments Non-equilibrium dynamics of interacting Fermi systems in quench experiments

2009-08-25

arxiv.org/abs/0908.3483v2

Physics

Condensed Matter

Quantum Gases

4 Pages, 2 Figs

Scientific paper

We describe the dynamics of two component non-interacting ultracold Fermions which are initially in thermal equilibrium and undergo a rapid quench to either the repulsive or attractive side of a Feshbach resonance. The short time dynamics is dominated by the exponentially growing collective modes. We study the Stoner instability and formation of ferromagnetic textures on the repulsive side, and the pairing instability towards BCS or FFLO-like states (determined by the population imbalance) on the attractive side. In each case, we evaluate the growth rate of unstable modes and predict the typical lengthscale of textures to be formed.

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