Inhomogeneous spin diffusion in traps with cold atoms

Details Inhomogeneous spin diffusion in traps with cold atoms Inhomogeneous spin diffusion in traps with cold atoms

2012-01-26

arxiv.org/abs/1201.5526v1

Physics

Condensed Matter

Quantum Gases

3 pages, 1 figure

Scientific paper

The spin diffusion and damped oscillations are studied in the collision of two spin polarized clouds of cold atoms with resonant interactions. The strong density dependence of the diffusion coefficient leads to inhomogeneous spin diffusion that changes from central to surface spin flow as the temperature increases. The inhomogeneity and the smaller finite trap size significantly reduce the spin diffusion rate at low temperatures. The resulting spin diffusion rates, spin drag and initial damped oscillations are compatible with measurements at low to high temperatures for resonant attractive interactions but are incompatible with a metastable ferromagnetic phase.

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