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19 April 2024

» arxiv » 0907.2888

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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 ;
Date:	16 Jul 2009
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.
Source:	arXiv, 0907.2888
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