Dc Josephson effect with Fermi gases in the Bose-Einstein regime

Year: 2009

Authors: Salasnich L., Ancilotto F., Toigo F.

Autors Affiliation: Univ Padua, Dipartimento Fis Galileo Galilei, I-35122 Padua, Italy; Univ Padua, CNISM, I-35122 Padua, Italy; CNR INFM, I-35122 Padua, Italy; CNISM, Unita Padova, I-35122 Padua, Italy

Abstract: We show that the dc Josephson effect with ultracold fermionic gases in the Bose-Einstein-condensate (BEC) regime of composite molecules can be described by a nonlinear Schrodinger equation (NLSE). By comparing our results with Bogoliubov-de Gennes calculations [Phys. Rev. Lett. 99, 040401 (2007)] we find that our superfluid NLSE, which generalizes the Gross-Pitaevskii equation taking into account the correct equation of state, is reliable in the BEC regime of the BCS-BEC crossover up to the limit of very large (positive) scattering length. We also predict that the Josephson current displays relevant beyond-mean-field effects.

Journal/Review: PHYSICAL REVIEW A

Volume: 79 (3)      Pages from: 033627  to: 033627

More Information: This work has been partially supported by Fondazione CARIPARO.
KeyWords: Bose-Einstein condensation; equations of state; fermion systems; Josephson effect; nonlinear differential equations
DOI: 10.1103/PhysRevA.79.033627

Citations: 58
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