Itinerant ferromagnetism in an interacting Fermi gas with mass imbalance

Details Itinerant ferromagnetism in an interacting Fermi gas with mass imbalance Itinerant ferromagnetism in an interacting Fermi gas with mass imbalance

2011-04-07

arxiv.org/abs/1104.1439v2

Phys. Rev. A 83, 053625 (2011)

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1103/PhysRevA.83.053625

We study the emergence of itinerant ferromagnetism in an ultra-cold atomic gas with a variable mass ratio between the up and down spin species. Mass imbalance breaks the SU(2) spin symmetry leading to a modified Stoner criterion. We first elucidate the phase behavior in both the grand canonical and canonical ensembles. Secondly, we apply the formalism to a harmonic trap to demonstrate how a mass imbalance delivers unique experimental signatures of ferromagnetism. These could help future experiments to better identify the putative ferromagnetic state. Furthermore, we highlight how a mass imbalance suppresses the three-body loss processes that handicap the formation of a ferromagnetic state. Finally, we study the time dependent formation of the ferromagnetic phase following a quench in the interaction strength.

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