Suppression of Persistent Currents in 1-D Disordered Rings by Coulomb Interaction

Details Suppression of Persistent Currents in 1-D Disordered Rings by Coulomb Interaction Suppression of Persistent Currents in 1-D Disordered Rings by Coulomb Interaction

1994-05-26

arxiv.org/abs/cond-mat/9405074v1

Physics

Condensed Matter

9 pages (RevTeX), 4 figures available upon request (katou@tansei.cc.u-tokyo.ac.jp), KCMG-preprint-HK1

Scientific paper

10.1103/PhysRevB.50.4943

Effects of Coulomb interaction on persistent currents in disordered one-dimensional rings are numerically investigated. First of all effectiveness of the Hartree-Fock approximation is established on small systems. Then the calculations are done for systems with 40 electrons in 100 sites. It is found that the amplitude of the average persistent current in the diffusive regime is suppressed as the strength of the Coulomb interaction increases. The suppression of the current is stronger in larger rings than in smaller ones. The enhancement of the current by the electron-electron interaction was not observed in the diffusive regime.

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