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Itinerant Ferromagnetism in an Ultracold Atom Fermi Gas | | R.A. Duine
; A.H. MacDonald
; | | Date: |
19 Apr 2005 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | Abstract: | 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. | | Source: | arXiv, cond-mat/0504459 | | Services: | Forum | Review | PDF | Favorites | |
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