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Phys. Rev. A 72, 025601 (2005) [4 pages]

Nonstandard pairing in asymmetric trapped Fermi gases

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Paolo Castorina1, Marcella Grasso1,2,3, Micaela Oertel4, Michael Urban3, and Dario Zappalà2
1Dipartimento di Fisica e Astronomia, Via Santa Sofia 64, I-95123 Catania, Italy
2INFN, Sezione di Catania, Via Santa Sofia 64, I-95123 Catania, Italy
3Institut de Physique Nucléaire, 15 rue Georges Clémenceau, F-91406 Orsay Cedex, France
4Service de Physique Nucléaire, CEA-DAM Ile-de-France, BP 12, F-91680 Bruyères-le-Châtel, France

Received 18 April 2005; published 15 August 2005

We study an ultracold trapped Fermi gas of atoms in two hyperfine states with unequal populations. In this situation the usual BCS pairing is suppressed and nonstandard pairing mechanisms become important. These are treated by solving the Bogoliubov–de Gennes equations, which at the same time correctly take into account the finite size of the trapped system. We find results which can be viewed as generalization of the LOFF (Larkin-Ovchinnikov-Fulde-Ferrel) phase to finite systems.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.025601
DOI:
10.1103/PhysRevA.72.025601
PACS:
03.75.Ss, 21.60.Jz