Spin drag and spin-charge separation in cold Fermi gases (Articolo in rivista)

Type
Label
  • Spin drag and spin-charge separation in cold Fermi gases (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Polini, M; Vignale, G (2007)
    Spin drag and spin-charge separation in cold Fermi gases
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Polini, M; Vignale, G (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 98 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • NEST CNR INFM, I-56126 Pisa, Italy; Scuola Normale Super Pisa, I-56126 Pisa, Italy; Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA (literal)
Titolo
  • Spin drag and spin-charge separation in cold Fermi gases (literal)
Abstract
  • Low-energy spin and charge excitations of one-dimensional interacting fermions are completely decoupled and propagate with different velocities. These modes, however, can decay due to several possible mechanisms. In this Letter we expose a new facet of spin-charge separation: not only the speeds but also the damping rates of spin and charge excitations are different. While the propagation of long-wavelength charge excitations is essentially ballistic, spin propagation is intrinsically damped and diffusive. We suggest that cold Fermi gases trapped inside a tight atomic waveguide offer the opportunity to measure the spin-drag relaxation rate that controls the broadening of a spin packet. (literal)
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