Josephson effect with superfluid fermions in the two-dimensional BCS-BEC crossover
arXiv:2007.07777 · doi:10.1103/PhysRevA.102.013325
Abstract
We investigate the macroscopic quantum tunneling of fermionic superfluids in the two-dimensional BCS-BEC crossover by using an effective tunneling energy which explicitly depends on the condensate fraction and the chemical potential of the system. We compare the mean-field effective tunneling energy with the beyond-mean-field one finding that the mean-field tunneling energy is not reliable in the BEC regime of the crossover. Then we solve the Josephson equations of the population imbalance and the relative phase calculating the frequency of tunneling oscillation both in the linear regime and in the nonlinear one. Our results show that the Josephson frequency is larger in the intermediate regime of the BCS-BEC crossover due to the peculiar behavior of the effective tunneling energy in the crossover.
arXiv comment7 pages, 4 figures, accepted for publication in Physical Review A
References in corpus (26)
- Observation of resonance condensation of fermionic atom pairs
- Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
- Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
- Extension of Bogoliubov theory to quasi-condensates
- Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
- Observation of a two-dimensional Fermi gas of atoms
- Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
- Evolution from BCS Superconductivity to Bose Condensation: Analytic Results for the crossover in three dimensions
- Observation of pair condensation in the quasi-2D BEC-BCS crossover
- BCS-BEC crossover in a two-dimensional Fermi gas
- Josephson effect in fermionic superfluids across the BEC-BCS crossover
- Ground-state pressure of quasi-2D Fermi and Bose gases
- Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region
- Thermodynamics of an attractive 2D Fermi gas
- Superfluid density and condensate fraction in the BCS-BEC crossover regime at finite temperatures
- Quantum fluctuations in the BCS-BEC crossover of two-dimensional Fermi gases
- Josephson tunneling between weakly interacting Bose-Einstein condensates
- An ideal Josephson junction in an ultracold two-dimensional Fermi gas
- Band-edge BCS-BEC crossover in a two-band superconductor: physical properties and detection parameters
- The Josephson effect throughout the BCS-BEC crossover
- Macroscopic Periodic Tunneling of Fermi Atoms in the BCS-BEC Crossover
- Finite-temperature quantum fluctuations in two-dimensional Fermi superfluids
- Condensate Fraction of a Two-Dimensional Attractive Fermi Gas
- Superfluid density and critical velocity near the fermionic Berezinskii-Kosterlitz-Thouless transition
- Critical Josephson current in BCS-BEC crossover superfluids
- Composite bosons in the 2D BCS-BEC crossover from Gaussian fluctuations
Cited by in corpus (6)
- Dissipation in a Finite Temperature Atomic Josephson Junction
- Josephson effect as signature of electron-hole superfluidity in bilayers of van der Waals heterostructures
- Quantum action of the Josephson dynamics
- Reliability of the Ginzburg-Landau Theory in the BCS-BEC Crossover by Including Gaussian Fluctuations for 3D Attractive Fermions
- Precision thermodynamics of the strongly interacting Fermi gas in two dimensions
- SNS Junctions along the BCS-BEC Crossover