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

Abstract

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.

4 pages, 2 figures

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• Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance
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Cited by in corpus (42)

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• Imbalanced Fermi Gases at Unitarity
• Correlated versus Ferromagnetic State in Repulsively Interacting Two-Component Fermi Gases
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• Quantum Order-by-Disorder in Strongly Correlated Metals
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• Itinerant ferromagnetism in 1D two-component Fermi gases
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• Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice
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• Exchange interactions in the Hubbard-Stratonovich transformation for the stability analysis of itinerant ferromagnetism
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• Tuning Density and Spin Ordering of Degenerate Fermi Gases in an Optical Cavity