Phys. Rev. A 79, 053606 (2009) [9 pages]Itinerant ferromagnetism in an atomic Fermi gas: Influence of population imbalanceReceived 19 November 2008; published 6 May 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.053606
DOI:
10.1103/PhysRevA.79.053606
PACS:
03.75.Ss, 71.10.Ca, 67.85.−d
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