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We investigate the effect of strong spin-orbit interaction on the electronictransport through non-magnetic impurities in one-dimensional systems. When aperpendicular magnetic field is applied, the electron spin polarization becomesmomentum-dependent and spin-flip scattering appears, to first order in theapplied field, in addition to the usual potential scattering. We analyze asituation in which, by tuning the Fermi level and the Rashba coupling, themagnetic field can suppress the potential scattering. This mechanism shouldgive rise to a significant negative magnetoresistance in the limit of largebarriers.Comment: 4 pages, 2 figure

Magnetically controlled impurities in quantum wires with strong Rashba coupling