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Author Duine, R. A. ♦ Polini, Marco ♦ Stoof, H. T. C. ♦ Vignale, G.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2010-02-11
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Condensed Matter - Quantum Gases ♦ physics:cond-mat
Abstract Recent experiments [Jo et al., Science 325, 1521 (2009)] have presented evidence of ferromagnetic correlations in a two-component ultracold Fermi gas with strong repulsive interactions. Motivated by these experiments we consider spin drag, i.e., frictional drag due to scattering of particles with opposite spin, in such systems. We show that when the ferromagnetic state is approached from the normal side, the spin drag relaxation rate is strongly enhanced near the critical point. We also determine the temperature dependence of the spin diffusion constant. In a trapped gas the spin drag relaxation rate determines the damping of the spin dipole mode, which therefore provides a precursor signal of the ferromagnetic phase transition that may be used to experimentally determine the proximity to the ferromagnetic phase.
Description Reference: Phys. Rev. Lett. 104, 220403 (2010)
Educational Use Research
Learning Resource Type Article
Page Count 4


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