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Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases (Articolo in rivista)

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Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases (Articolo in rivista) (literal)

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Rainis, D; Polini, M; Tosi, MP; Vignale, G (2008)
Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases
(literal)

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\"[Rainis, Diego; Polini, Marco; Tosi, M. P.] NEST CNR INFM, I-56126 Pisa, Italy; [Rainis, Diego; Polini, Marco; Tosi, M. P.] Scuola Normale Super Pisa, I-56126 Pisa, Italy; [Vignale, G.] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA (literal)

Titolo

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

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 tau(sd). In this paper we present both numerical and analytical calculations of tau(sd) for a two-component spin-polarized cold Fermi gas trapped inside a tight atomic waveguide. At low temperatures we find an activation law for tau(sd), 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. (literal)

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