A repulsive atomic gas in a harmonic trap on the border of itinerant ferromagnetism

Details A repulsive atomic gas in a harmonic trap on the border of itinerant ferromagnetism A repulsive atomic gas in a harmonic trap on the border of itinerant ferromagnetism

2009-07-21

arxiv.org/abs/0907.3725v2

Physics

Condensed Matter

Quantum Gases

4 pages, 2 figures

Scientific paper

Alongside superfluidity, itinerant (Stoner) ferromagnetism remains one of the most well-characterized phases of correlated Fermi systems. A recent experiment has reported the first evidence for novel phase behavior on the repulsive side of the Feshbach resonance in a two-component ultracold Fermi gas. By adapting recent theoretical studies to the atomic trap geometry, we show that an adiabatic ferromagnetic transition would take place at a weaker interaction strength than is observed in experiment. This discrepancy motivates a simple non-equilibrium theory that takes account of the dynamics of magnetic defects and three-body losses. The formalism developed displays good quantitative agreement with experiment.

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