Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

Abstract

Can a gas of spin-up and spin-down fermions become ferromagnetic due to repulsive interactions? This question which has not yet found a definitive theoretical answer was addressed in an experiment with an ultracold two-component Fermi gas. The observation of non-monotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. It implies that itinerant ferromagnetism of delocalized fermions is possible without lattice and band structure and validates the most basic model for ferromagnetism introduced by Stoner.

17 pages, 5 figures (incl. Supplemental Material)

References in corpus (7)

• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Observation of Bose-Einstein Condensation of Molecules
• Strong dipolar effects in a quantum ferrofluid
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