Correlated versus Ferromagnetic State in Repulsively Interacting Two-Component Fermi Gases

Abstract

Whether a spin-1/2 Fermi gas will become ferromagnetic as the strength of repulsive interaction increases is a long-standing controversial issue. Recently this problem is studied experimentally by Jo et al, Science, 325, 1521 (2009) in which the authors claim a ferromagnetic transition is observed. This work is to point out the results of this experiment can not distinguish whether the system is in a ferromagnetic state or in a non-magnetic but strongly short-range correlated state. A conclusive experimental demonstration of ferromagnetism relies on the observation of ferromagnetic domains.

4 pages, 2 figures, published version

References in corpus (2)

• Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
• A repulsive atomic gas in a harmonic trap on the border of itinerant ferromagnetism

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