2012/07/19 by M. P. Mink, V. P. J. Jacobs, Marco Polini +4 · 1 citation
Physics and Astronomy · #Boltzmann constant #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Cuprate #Diffusion #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Pairing #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum many-body systems #Quantum mechanics #Relaxation (psychology) #Spin (aerodynamics) #Spin diffusion #Superconductivity #Thermodynamics #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.86.063631
published as Phys. Rev. A 86, 063631 (2012) · 9 pages, 10 figures
arxiv created 2012/07/19 · openalex publication_date 2012/12/26 · arxiv updated 2013/04/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider spin transport in a two-component ultracold Fermi gas with attractive interspecies interactions close to the BCS pairing transition. In particular, we consider the spin-transport relaxation rate and the spin-diffusion constant. Upon approaching the transition, the scattering amplitude is enhanced by pairing fluctuations. However, as the system approaches the transition, the spectral weight for excitations close to the Fermi level is decreased by the formation of a pseudogap. To study the consequence of these two competing effects, we determine the spin-transport relaxation rate and the spin-diffusion constant using both a Boltzmann approach and a diagrammatic approach. The former ignores pseudogap physics and finite lifetime effects. In the latter, we incorporate the full pseudogap physics and lifetime effects, but we ignore vertex corrections, so that we effectively calculate single-particle relaxation rates instead of transport relaxation rates. We find that there is qualitative agreement between these two approaches, although the results for the transport coefficients differ quantitatively.