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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superfluidity

Background:

  • Atomic Josephson junctions are crucial for studying superfluidity in Fermi gases.
  • Understanding dissipation mechanisms is key to controlling quantum transport.

Purpose of the Study:

  • To investigate the microscopic origins of dissipation in superfluid Fermi gases.
  • To explore the relationship between dissipation, phase coherence, and transport properties in Josephson junctions.

Main Methods:

  • Theoretical study of atomic Josephson junctions between weakly coupled superfluid Fermi gases.
  • Analysis across the Bose-Einstein condensate-Bardeen-Cooper-Schrieffer crossover.
  • Tuning bias chemical potential to explore different dynamical regimes.

Main Results:

  • Vortex-induced phase slippage identified as the dominant dissipation source.
  • Coexistence of dissipation and phase coherence observed for small excitations.
  • Vortex nucleation linked to conductance and critical current trends.

Conclusions:

  • Dissipation in superfluid Fermi gases is fundamentally linked to vortex dynamics.
  • Findings offer new avenues for studying dissipative quantum transport in strongly correlated systems.