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Title: Spin dependent scattering in magnetized Luttinger liquids
Authors: Araújo, Miguel
Berakdar, Jamal
Dugaev, Vitalii
Vieira, Vítor
Keywords: spintrónica
líquido de Luttinger
Issue Date: 2008
Publisher: Physica E
Citation: Physica E , 40, 1736 (2008)
Abstract: For a magnetized one-dimensional Luttinger liquid (LL) we study the influence of spin-dependent scattering from a localized magnetization inhomogeneity caused, e.g. by a local external magnetic field. Two cases are considered: (i) a uniformly magnetized LL close to an external magnetic tip that scatters the electrons and (ii) a LL with two domains, one paramagnetic and the other ferromagnetic. A renormalization group treatment of electron interactions yields scaling equations for the transmission and reflection amplitudes. For repulsive interactions we find two possible zero temperature insulator fixed points: one in which the carriers are reflected in the same spin channel and another where the electron spin is reversed upon reflection, leading to a finite spin current and vanishing charge current under a small voltage bias. In case (ii) we find the ‘‘spin-flip-insulating’’ regime to be stabilized by a pure potential scattering as caused, e.g. by impurities
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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