Persistent Currents in Multichannel Interacting Systems

Details Persistent Currents in Multichannel Interacting Systems Persistent Currents in Multichannel Interacting Systems

1994-12-20

arxiv.org/abs/cond-mat/9412086v3

Physics

Condensed Matter

Revised version, uuencoded compressed file including figs

Scientific paper

10.1103/PhysRevB.52.10772

Persistent currents of disordered multichannel mesoscopic rings of spinless interacting fermions threaded by a magnetic flux are calculated using exact diagonalizations and self-consistent Hartree-Fock methods. The validity of the Hartree-Fock approximation is controled by a direct comparison with the exact results on small $4\times4$ clusters. For sufficiently large disorder (diffusive regime), the effect of repulsive interactions on the current distribution is to slightly decrease its width (mean square current) but to {\it increase} its mean value (mean current). This effect is stronger in the case of a long range repulsion. Our results suggest that the coupling between the chains is essential to understand the large currents observed experimentally.

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