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    Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases

    Rainis, Diego
    Polini, Marco
    Tosi, M. P.
    Vignale, Giovanni, 1957-
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    [PDF] SpinDragRelaxationTime.pdf (1.442Mb)
    Date
    2008
    Format
    Article
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    Abstract
    Spin propagation in systems of one- dimensional interacting fermions at finite temperature is intrinsically diffusive. The spreading rate of a spin packet is controlled by a transport coefficient termed “spin drag” relaxation time τsd. In this paper we present both numerical and analytical calculations of τsd for a two-component spin-polarized cold Fermi gas trapped inside a tight atomic waveguide. At low temperatures we find an activation law for τsd, in agreement with earlier calculations of Coulomb drag between slightly asymmetric quantum wires, but with a different and much stronger temperature dependence of the prefactor. Our results provide a fundamental input for microscopic time-dependent spin-density functional theory calculations of spin transport in one-dimensional inhomogeneous systems of interacting fermions.
    URI
    http://hdl.handle.net/10355/7724
    Citation
    Phys. Rev. B 77, 035113 (2008) [6 pages]
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