Transverse spin diffusion in strongly interacting Fermi gases

Abstract

We compute spin diffusion in a dilute Fermi gas at arbitrary temperature, polarization and strong interaction in the normal phase using kinetic theory. While the longitudinal spin diffusivity depends weakly on polarization and diverges for small temperatures, the transverse spin diffusivity D_\perp has a strong polarization dependence and approaches a finite value for T->0 in the Fermi liquid phase. For a 3D unitary Fermi gas at infinite scattering length the diffusivities reach a minimum near the quantum limit of diffusion \hbar/m in the quantum degenerate regime and are strongly suppressed by medium scattering, and we discuss the importance of the spin-rotation effect. In two dimensions, D_\perp attains a minimum at strong coupling -1 < ln(kFa2D) < 1 and reaches D_\perp~0.2...0.3\hbar/m at large polarization. These values are consistent with recent measurements of two-dimensional ultracold atomic gases in the strong coupling regime.

11 pages, 7 figures; published version

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Cited by in corpus (15)

• Transverse Demagnetization Dynamics of a Unitary Fermi Gas
• Observation of quantum-limited spin transport in strongly interacting two-dimensional Fermi gases
• Observation of the Leggett-Rice effect in a unitary Fermi gas
• Universal Spin Transport and Quantum Bounds for Unitary Fermions
• Collective modes of ultracold fermionic alkaline-earth gases with SU(N) symmetry
• Quasiparticle scattering rate in a strongly polarised Fermi mixture
• Nonlinear spin diffusion and spin rotation in a trapped Fermi gas
• Collisionless spin dynamics in a magnetic field gradient
• Spin diffusion in ultracold spin-orbit coupled ${}^{40}$K gas
• Bulk viscosity of resonantly interacting fermions in the quantum virial expansion
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Probing Goldstino excitation through the tunneling transport in a Bose-Fermi mixture with explicitly broken supersymmetry
• A generalized Theory of Diffusion based on Kinetic Theory
• Magnonic spin current shot noise in an itinerant Fermi gas
• Crossover from collisionless to collisional spin dynamics of polarized fermions