Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
Name
Ketterle_Itinerant ferromagnetism.pdf
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Author(s)
Jo, Gyu-Boong
Lee, Ye-Ryoung
Choi, Jae-Hoon
Christensen, Caleb A.
Kim, Tony Hyun
Pritchard, David E.
Ketterle, Wolfgang
Thywissen, Joseph H.
Date Issued
September 2009
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Jo, G.-B., Y.-R. Lee, J.-H. Choi, C. A. Christensen, T. H. Kim, J. H. Thywissen, D. E. Pritchard, and W. Ketterle. “Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms.” Science 325, no. 5947 (September 18, 2009): 1521–1524.
Version
Original manuscript
Abstract
Can a gas of spin-up and spin-down fermions become ferromagnetic because of repulsive interactions? We addressed this question, for which there is not yet a definitive theoretical answer, in an experiment with an ultracold two-component Fermi gas. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. Our observations imply that itinerant ferromagnetism of delocalized fermions is possible without lattice and band structure, and our data validate the most basic model for ferromagnetism introduced by Stoner.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
MIT-Harvard Center for Ultracold Atoms
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1126/science.1177112
