Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions
Abstract
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.
Cite
@article{arxiv.1012.3827,
title = {Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions},
author = {R. A. Duine and Marco Polini and Arnaud Raoux and H. T. C. Stoof and G. Vignale},
journal= {arXiv preprint arXiv:1012.3827},
year = {2011}
}
Comments
Submitted to New Journal of Physics Focus Issue "Strongly Correlated Quantum Fluids: From Ultracold Quantum Gases to QCD Plasmas"