Itinerant Ferromagnetism in an Ultracold Atom Fermi Gas

Details Itinerant Ferromagnetism in an Ultracold Atom Fermi Gas Itinerant Ferromagnetism in an Ultracold Atom Fermi Gas

2005-04-18

arxiv.org/abs/cond-mat/0504459v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.230403

We address the possible occurrence of ultracold atom ferromagnetism by evaluating the free energy of a spin polarized Fermi gas to second order in its interaction parameter. We find that Hartree-Fock theory underestimates the tendency toward ferromagnetism, predict that the ferromagnetic transition is first order at low temperatures, and point out that the spin coherence time of gases prepared in a ferromagnetic state is strongly enhanced as the transition is approached. We relate our results to recent experiments.

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