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    Spin Drag and Spin-Charge Separation in Cold Fermi Gases

    Polini, Marco
    Vignale, Giovanni, 1957-
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    [PDF] SpinDragSpinChargeSeperation.pdf (324.4Kb)
    Date
    2007
    Format
    Article
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    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.
    URI
    http://hdl.handle.net/10355/7731
    Citation
    Phys. Rev. Lett. 98, 266403 (2007) [4 pages]
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