Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions

Details Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions

2010-12-17

arxiv.org/abs/1012.3827v1

New J. Phys. 13, 045010 (2011)

Physics

Condensed Matter

Quantum Gases

Submitted to New Journal of Physics Focus Issue "Strongly Correlated Quantum Fluids: From Ultracold Quantum Gases to QCD Plasm

Scientific paper

10.1088/1367-2630/13/4/045010

We calculate the spin-drag relaxation rate for a two-component ultracold atomic Fermi gas with positive scattering length between the two spin components. In one dimension we find that it vanishes linearly with temperature. In three dimensions the spin-drag relaxation rate vanishes quadratically with temperature for sufficiently weak interactions. This quadratic temperature dependence is present, up to logarithmic corrections, in the two-dimensional case as well. For stronger interaction the system exhibits a Stoner ferromagnetic phase transition in two and three dimensions. We show that the spin-drag relaxation rate is enhanced by spin fluctuations as the temperature approaches the critical temperature of this transition from above.

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