Spin fluctuations, susceptibility and the dipole oscillation of a nearly ferromagnetic Fermi gas

Year: 2011

Authors: Recati A., Stringari S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento and INO-CNR BEC Center, I-38123 Povo, Italy

Abstract: We discuss the spin fluctuations and the role played by the magnetic susceptibility in an atomic Fermi gas interacting with a positive scattering length. Both thermal and zero-temperature quantum fluctuations are considered. Using a sum rule approach and recent ab initio Monte Carlo results for the magnetic susceptibility of uniform matter, we provide explicit predictions for the frequency of the spin dipole oscillation of a gas trapped by a harmonic potential and discuss the deviations from the ideal gas behavior when the system approaches the ferromagnetic transition. The role of the Landau’s parameters in the characterization of the magnetic properties is also discussed.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 106 (8)      Pages from: 80402-1  to: 80402-4

More Information: We thank G. Bertaina for the Monte Carlo data and F. Piazza for useful comments on the manuscript, and we acknowledge useful discussions with W. Ketterle, L. P. Pitaevskii, and W. Zwerger. This research has been supported by the EuroQUAM Fermix program and by MIUR PRIN 2007.
KeyWords: Sum-rules
DOI: 10.1103/PhysRevLett.106.080402

Citations: 48
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