2014/08/20 by Boyang Liu, Hui Zhai, Shizhong Zhang · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Crossover #Electrical resistivity and conductivity #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Mesoscopic physics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Residual resistivity #Superconductivity #Superfluidity #Unitary state #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.90.051602
published as Phys. Rev. A 90, 051602(R) (2014) · 8 pages and 4 figures including supplementary materials
arxiv created 2014/08/20 · openalex publication_date 2014/11/21 · arxiv updated 2014/12/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this Rapid Communication we investigate the fluctuation effects on the transport properties of unitary Fermi gases in the vicinity of the superfluid transition temperature Tc. Based on the time-dependent Ginzburg-Landau formalism of the Bose-Einstein condensate--BCS crossover, we investigate both the residual resistivity below Tc induced by phase slips and the paraconductivity above Tc 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 Tc increases as one approaches the unitary limit, consistent with recent experiments, the paraconductivity exhibits nonmonotonic behavior. Our results can be verified with the recently developed transport apparatus using mesoscopic channels.