Dissipation Mechanisms in Fermionic Josephson Junction

Year: 2023

Authors: Wlazlowski G., Xhani K., Tylutki M., Proukakis NP., Magierski P.

Autors Affiliation: Warsaw Univ Technol, Fac Phys, Ul Koszykowa 75, PL-00662 Warsaw, Poland; Univ Washington, Dept Phys, Seattle, WA 98195 USA; Consiglio Nazl Ric CNR INO, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; Newcastle Univ, Joint Quantum Ctr JQC Durham Newcastle, Sch Math Stat & Phys, Newcastle Upon Tyne NE1 7RU, England.

Abstract: We characterize numerically the dominant dynamical regimes in a superfluid ultracold fermionic Josephson junction. Beyond the coherent Josephson plasma regime, we discuss the onset and physical mechanism of dissipation due to the superflow exceeding a characteristic speed, and provide clear evidence distinguishing its physical mechanism across the weakly and strongly interacting limits, despite qualitative dynamics of global characteristics being only weakly sensitive to the operating dissipative mechanism. Specifically, dissipation in the strongly interacting regime occurs through the phase-slippage process, caused by the emission and propagation of quantum vortices, and sound waves-similar to the Bose -Einstein condensation limit. Instead, in the weak interaction limit, the main dissipative channel arises through the pair-breaking mechanism.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 130 (2)      Pages from: 23003-1  to: 23003-7

More Information: The calculations were executed by means of the W-SLDA Toolkit [50] . Detailed instructions allowing for reproduction of the presented results are given in the Supplemental Material [41] . We thank G. Roati, W. J. Kwon, and M. M. Forbes for fruitful discussions. We acknowledge PRACE for awarding us access toresource Piz Daint based in Switzerland at Swiss National Supercomputing Centre (CSCS) , decision No. 2021240031. This work was supported by the Polish National Science Center (NCN) under Contracts No. UMO-2017/26/E/ST3/00428 (G. W.) , No. UMO-2019/35/D/ST2/00201 (M. T.) , and No. UMO-2017/27/B/ST2/02792 (P. M.) , and the European Union’s Horizon 2020 research and innovation programme under the Qombs project FET Flagship on Quantum Technologies GA No. 820419 (K. X.) . Calculations were executed by G. W. and M. T., data analysis was performed by G. W., K. X., and M. T. All authors contributed to research planning, interpretation of the results, and manuscript writing.
KeyWords: Oscillations
DOI: 10.1103/PhysRevLett.130.023003

Citations: 10
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