Giant magnetoresistance in Hubbard chains

We use numerically unbiased methods to show that the one-dimensional (1D) Hubbard model with periodically distributed onsite interactions already contains the minimal ingredients to display the phenomenon of magnetoresistance, i.e., by applying an external magnetic field, a dramatic enhancement on the charge transport is achieved. We reach this conclusion based on the computation of the Drude weight and of the single-particle density of states, applying twisted boundary condition (TBC) averaging to reduce finite-size effects. The known picture that describes the giant magnetoresistance, by interpreting the scattering amplitudes of parallel or anti-parallel polarized currents with local magnetizations, is here obtained without having to resort to different entities: Itinerant and localized charges are indistinguishable.