The Josephson effect throughout the BCS-BEC crossover
arXiv:0705.2658 · doi:10.1103/PhysRevLett.99.040401
Abstract
We study the stationary Josephson effect for neutral fermions across the BCS-BEC crossover, by solving numerically the Bogoliubov-de Gennes equations at zero temperature. The Josephson current is found to be considerably enhanced for all barriers at about unitarity. For vanishing barrier, the Josephson critical current approaches the Landau limiting value which, depending on the coupling, is determined by either pair-breaking or sound-mode excitations. In the coupling range from the BCS limit to unitarity, a procedure is proposed to extract the pairing gap from the Landau limiting current.
4 pages, 3 figures; improved version to appear in Phys. Rev. Lett
References in corpus (5)
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Weakly bound dimers of fermionic atoms
- BCS-BEC crossover at finite temperature in the broken-symmetry phase
- Time-dependent Gross-Pitaevskii equation for composite bosons as the strong-coupling limit of the fermionic BCS-RPA approximation