Critical Transport and Vortex Dynamics in a Thin Atomic Josephson Junction

Year: 2020

Authors: Xhani K., Neri E., Galantucci L., Scazza F., Burchianti A., Lee K.-L., Barenghi C.F., Trombettoni A., Inguscio M., Zaccanti M., Roati G., Proukakis N.P.,

Autors Affiliation: Newcastle Univ, Sch Math Stat & Phys, Joint Quantum Ctr JQC Durham Newcastle, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England; Univ Firenze, European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy; Univ Firenze, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; CNR, INO, I-50019 Sesto Fiorentino, Italy; CNR, IOM DEMOCRITOS Simulat Ctr, Via Bonomea 265, I-34136 Trieste, Italy; SISSA, Via Bonomea 265, I-34136 Trieste, Italy; Univ Rome, Dept Engn, Campus Biomed, I-00128 Rome, Italy.

Abstract: We study the onset of dissipation in an atomic Josephson junction between Fermi superfluids in the molecular Bose-Einstein condensation limit of strong attraction. Our simulations identify the critical population imbalance and the maximum Josephson current delimiting dissipationless and dissipative transport, in quantitative agreement with recent experiments. We unambiguously link dissipation to vortex ring nucleation and dynamics, demonstrating that quantum phase slips are responsible for the observed resistive current. Our work directly connects microscopic features with macroscopic dissipative transport, providing a comprehensive description of vortex ring dynamics in three-dimensional inhomogeneous constricted superfluids at zero and finite temperatures.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 124 (4)      Pages from: 45301-1  to: 45301-6

More Information: We thank A. Smerzi and A. Munoz Mateo for valuable discussions. This work was supported by QuantERA project NAQUAS (EPSRC EP/R043434/1), EPSRC project EP/R005192/1, Fondazione Cassa di Risparmio di Firenze project QuSim2D 2016.0770, European Research Council Grant Agreements No. 307032 QuFerm2D and No. 637738 PoLiChroM, and European Union’s Horizon 2020 research and innovation programme under the Marie SklodowskaCurie Grant Agreement No. 705269.
KeyWords: Bose-condensate; Superfluid He-4; Dissipation; Transition; Flow
DOI: 10.1103/PhysRevLett.124.045301

Citations: 37
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