Enhanced Charge and Spin Currents in the One-Dimensional Disordered Mesoscopic Hubbard Ring

Details Enhanced Charge and Spin Currents in the One-Dimensional Disordered Mesoscopic Hubbard Ring Enhanced Charge and Spin Currents in the One-Dimensional Disordered Mesoscopic Hubbard Ring

1995-06-24

arxiv.org/abs/cond-mat/9505110v1

Physics

Condensed Matter

20 RevTeX 3.0 pages, 8 figures NOT included

Scientific paper

10.1103/PhysRevB.52.14809

We consider a one-dimensional mesoscopic Hubbard ring with and without disorder and compute charge and spin stiffness as a measure of the permanent currents. For finite disorder we identify critical disorder strength beyond which the charge currents in a system with repulsive interactions are {\em larger} than those for a free system. The spin currents in the disordered repulsive Hubbard model are enhanced only for small $U$, where the magnetic state of the system corresponds to a charge density wave pinned to the impurities. For large $U$, the state of the system corresponds to localized isolated spins and the spin currents are found to be suppressed. For the attractive Hubbard model we find that the charge currents are always suppressed compared to the free system at all length scales.

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