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Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

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arxiv 0907.2888 v1 pith:NV2JDTPO submitted 2009-07-16 cond-mat.quant-gas cond-mat.str-el

Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

Gyu-Boong Jo , Ye-Ryoung Lee , Jae-Hoon Choi , Caleb A. Christensen , Tony H. Kim , Joseph H. Thywissen , David E. Pritchard , Wolfgang Ketterle This is my paper
classification cond-mat.quant-gas cond-mat.str-el
keywords ferromagnetismfermifermionsferromagneticinteractionsitinerantrepulsiveultracold
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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.

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