Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance

Details Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalance

2009-05-13

arxiv.org/abs/0905.2036v2

Phys. Rev. A 79, 053606 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures, typos added, references added

Scientific paper

10.1103/PhysRevA.79.053606

We investigate ferromagnetic ordering in an itinerant ultracold atomic Fermi gas with repulsive interactions and population imbalance. In a spatially uniform system, we show that at zero temperature the transition to the itinerant magnetic phase transforms from first to second order with increasing population imbalance. Drawing on these results, we elucidate the phases present in a trapped geometry, finding three characteristic types of behavior with changing population imbalance. Finally, we outline the potential experimental implications of the findings.

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