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Dissipation Mechanisms in Fermionic Josephson Junction.
Gabriel Wlazłowski1,2, Klejdja Xhani3, Marek Tylutki1
1Faculty of Physics, Warsaw University of Technology, Ulica Koszykowa 75, 00-662 Warsaw, Poland.
Physical Review Letters
|January 27, 2023
Summary
We numerically characterized superfluid ultracold fermionic Josephson junctions, revealing distinct dissipation mechanisms in weak versus strong interactions. Dissipation arises from pair-breaking in weak interactions and quantum vortex emission in strong interactions.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Condensed Matter Physics
- Quantum Fluids
Background:
- Superfluid ultracold fermionic Josephson junctions exhibit complex dynamics.
- Understanding dissipation mechanisms is crucial for controlling these quantum systems.
Purpose of the Study:
- To numerically characterize the dominant dynamical regimes in superfluid ultracold fermionic Josephson junctions.
- To distinguish the physical mechanisms of dissipation in weakly and strongly interacting limits.
Main Methods:
- Numerical characterization of superfluid ultracold fermionic Josephson junctions.
- Analysis of dissipation onset and physical mechanisms.
Main Results:
- Identified distinct dissipation mechanisms in weak and strong interaction regimes.
- In the strongly interacting regime, dissipation occurs via phase-slippage, quantum vortex emission, and sound waves.
- In the weakly interacting regime, dissipation primarily arises from pair-breaking mechanisms.
Conclusions:
- The physical mechanisms of dissipation differ significantly between weakly and strongly interacting fermionic Josephson junctions.
- Despite differing mechanisms, global dynamics show weak sensitivity to the operating dissipative channel.
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