Fluctuation Effects on the Transport Properties of Unitary Fermi Gases

Abstract

In this letter, we investigate the fluctuation effects on the transport properties of unitary Fermi gases in the vicinity of the superfluid transition temperature $T_c$. Based on the time-dependent Ginzburg-Landau formalism of the BEC-BCS crossover, we investigate both the residual resistivity below $T_c$ induced by phase slips and the paraconductivity above $T_c$ due to pair fluctuations. These two effects have been well studied in the weak coupling BCS superconductor, and here we generalize them to the unitary regime of ultracold Fermi gases. We find that while the residual resistivity below $T_c$ increases as one approaches the unitary limit, consistent with recent experiments, the paraconductivity exhibits non-monotonic behavior. Our results can be verified with the recently developed transport apparatus using mesoscopic channels.

arXiv comment8 pages and 4 figures including supplementary materials

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Cited by in corpus (10)

• Quantum thermodynamic devices: from theoretical proposals to experimental reality
• Quantum transport in ultracold atoms
• Two-terminal transport measurements with cold atoms
• Connecting strongly correlated superfluids by a quantum point contact
• Connecting dissipation and phase slips in a Josephson junction between fermionic superfluids
• Controlled Transport between Fermi Superfluids Through a Quantum Point Contact
• Giant Enhancement of the Thermo-Particle Transport Figure of Merit and Breakdown of the Wiedemann-Franz Law in Unitary Fermi Gases
• Enhanced superconducting-fluctuation effects on thermodynamic properties in BCS-BEC-crossover regime
• Stabilization of vortex-liquid state by strong pairing interaction
• Pair Fluctuation Effects on Quasiparticle Transport in Fermi Systems