Ultracold fermions with repulsive interactions
Name
Ketterle_Ultracold fermions.pdf
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283.55 KB
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Adobe PDF
Checksum (MD5)
51b3de1c500b75446c8b2ab431c4afc5
Author(s)
Ketterle, Wolfgang
Date Issued
August 2013
Journal
EPJ Web of Conferences
Publisher
EDP Sciences
Citation
Ketterle, W. “Ultracold Fermions with Repulsive Interactions.” Edited by O. Dulieu, P. Grangier, M. Leduc, and H. Perrin. EPJ Web of Conferences 57 (2013): 01001.
Version
Final published version
Abstract
An ultracold Fermi gas with repulsive interaction has been studied. For weak interactions, the atomic gas is metastable, and the interactions were characterized by obtaining the isothermal compressibility from atomic density profiles. For stronger interactions (k[subscript F]a ≈ 1), rapid conversion into Feshbach molecules is observed. When the conversion rate becomes comparable to the Fermi energy divided by η, the atomic gas cannot reach equilibrium without forming pairs. This precludes the predicted transition to a ferromagnetic state (Stoner transition). The absence of spin fluctuations proves that the gas stays paramagnetic. In free space, a Fermi gas with strong short-range repulsion does not exist because of the rapid coupling to molecular states.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1051/epjconf/20135701001
