1994/12/31 by G. Bouzerar, Georges BOUZERAR, Didier Poilblanc +1 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Theoretical and Computational Physics #cond-mat
paper · pdf · doi:10.1103/physrevb.52.10772
Revised version, uuencoded compressed file including figs
arxiv created 1995/02/20 · openalex publication_date 1995/10/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Persistent currents in disordered multichannel mesoscopic rings threaded by a magnetic flux are calculated using exact diagonalizations and self-consistent Hartree-Fock treatments of two-dimensional tori and cylinders of spinless interacting fermions. The validity of the Hartree-Fock approximation is controlled by a direct comparison with the exact results on small 4\ifmmode×\else\texttimes\fi4 clusters. The existence of a crossover value for the disorder parameter Wc (depending on the electronic density and the system size) separating two different regimes is established. Decomposing the current I(\ensuremathφ) in terms of its fundamental harmonics, we find that, while the first harmonic is always enhanced by the interaction, the second harmonic is enhanced for WWc and strongly suppressed otherwise. This effect is stronger as we increase the disorder.