Spin drag in an ultracold Fermi gas on the verge of a ferromagnetic instability
arXiv:1002.2371 · doi:10.1103/PhysRevLett.104.220403
Abstract
Recent experiments [Jo et al., Science 325, 1521 (2009)] have presented evidence of ferromagnetic correlations in a two-component ultracold Fermi gas with strong repulsive interactions. Motivated by these experiments we consider spin drag, i.e., frictional drag due to scattering of particles with opposite spin, in such systems. We show that when the ferromagnetic state is approached from the normal side, the spin drag relaxation rate is strongly enhanced near the critical point. We also determine the temperature dependence of the spin diffusion constant. In a trapped gas the spin drag relaxation rate determines the damping of the spin dipole mode, which therefore provides a precursor signal of the ferromagnetic phase transition that may be used to experimentally determine the proximity to the ferromagnetic phase.
4 pages, 3 figs
References in corpus (7)
- Theory of ultracold Fermi gases
- Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
- Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
- Anomalous Coulomb drag in electron-hole bilayers
- Spin Drag and Spin-Charge Separation in Cold Fermi Gases
- Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
- Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases
Cited by in corpus (10)
- Quantum mechanical limitations to spin diffusion in the unitary Fermi gas
- Spin transport in a unitary Fermi gas close to the BCS transition
- Finite range and upper branch effects on itinerant ferromagnetism in repulsive Fermi gases: Bethe-Goldstone ladder resummation approach
- Spin Drag in Ultracold Fermi Mixtures with Repulsive Interactions
- Probing ultracold Fermi gases with light-induced gauge potentials
- Spin transport between polarized Fermi gases near the ferromagnetic phase transition
- Magnon drag induced by magnon-magnon interactions characteristic of noncollinear magnets
- Interband magnon drag in ferrimagnetic insulators
- Matsubara-Frequency-Resolved Spin Exchange-Correlation Kernel for the Three-Dimensional Uniform Electron Gas
- Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling