The Josephson effect throughout the BCS-BEC crossover

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

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Cited by in corpus (50)

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• Josephson effect in fermionic superfluids across the BEC-BCS crossover
• Critical velocity for superfluid flow across the BEC-BCS crossover
• Connecting dissipation and phase slips in a Josephson junction between fermionic superfluids
• Optimal Persistent Currents for Interacting Bosons on a Ring with a Gauge Field
• Strongly correlated superfluid order parameters from dc Josephson supercurrents
• Dark solitons in a superfluid Fermi gas
• An ideal Josephson junction in an ultracold two-dimensional Fermi gas
• Collective Excitations and Nonequilibrium Phase Transition in Dissipative Fermionic Superfluids
• DC Josephson Effect with Fermi gases in the Bose-Einstein regime
• Macroscopic Periodic Tunneling of Fermi Atoms in the BCS-BEC Crossover
• Self-trapping of a Fermi super-fluid in a double-well potential in the BEC-unitarity crossover
• Critical velocity of superfluid flow through single barrier and periodic potentials
• Tunneling transport of unitary fermions across the superfluid transition
• Comparative Study of BCS-BEC Crossover Theories above $T_c$: the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
• Phase Separation Dynamics Induced by an Interaction Quench of a Correlated Fermi-Fermi Mixture in a Double Well
• Josephson plasma oscillations and the Gross-Pitaevskii equation: Bogoliubov approach vs two-mode model
• Comparison of Different Pairing Fluctuation Approaches to BCS-BEC Crossover
• BCS-BEC crossover in a random external potential
• Grey solitons in a strongly interacting superfluid Fermi Gas
• Correlated Tunneling Dynamics of an Ultracold Fermi-Fermi Mixture Confined in a Double-Well
• Current-Phase Relation of a Bose-Einstein Condensate Flowing Through a Weak Link
• Critical Josephson current in BCS-BEC crossover superfluids
• Equation for the superfluid gap obtained by coarse graining the Bogoliubov-de Gennes equations throughout the BCS-BEC crossover
• Josephson junction dynamics in a two-dimensional ultracold Bose gas
• Equation of state and effective mass of the unitary Fermi gas in a 1D periodic potential
• Josephson oscillations and self-trapping of superfluid fermions in a double-well potential
• Non-linear mixing of Bogoliubov modes in a bosonic Josephson junction
• DC and AC Josephson effects with superfluid Fermi atoms across a Feshbach resonance
• Dissipation Mechanisms in Fermionic Josephson Junction
• Persistent currents in ultracold gases
• Instability of superfluid Fermi gases induced by a roton-like density mode in optical lattices
• Josephson effect at finite temperature along the BCS-BEC crossover
• Effects of periodic potentials on the critical velocity of superfluid Fermi gases in the BCS-BEC crossover
• Josephson effect with superfluid fermions in the two-dimensional BCS-BEC crossover
• Dissipation in a Finite Temperature Atomic Josephson Junction
• Dynamical control of the conductivity of an atomic Josephson junction
• Quantum fluctuations in atomic Josephson junctions: the role of dimensionality
• Josephson effect as signature of electron-hole superfluidity in bilayers of van der Waals heterostructures
• Tunneling of polarized fermions in 3D double wells
• Effect of Disorder in BCS-BEC Crossover
• Effective Hamiltonian based Monte Carlo for the BCS to BEC crossover in the attractive Hubbard model
• Spin-asymmetric Josephson plasma oscillations
• Current Conservation in the Self-Consistent Josephson Junction
• Collective excitation and stability of flow-induced gapless Fermi superfluids
• Relative Phase and Josephson Dynamics between Weakly Coupled Richardson Models
• Reliability of the Ginzburg-Landau Theory in the BCS-BEC Crossover by Including Gaussian Fluctuations for 3D Attractive Fermions
• Coherent and dissipative transport in a Josephson junction between fermionic superfluids of ${}^6$Li atoms
• Tunneling Hamiltonian analysis of DC Josephson currents in a weakly-interacting Bose-Einstein condensate