2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22520We show exactly that small Hubbard rings exhibit unusual kink-like structures giving anomalous oscillations in persistent current. Singular behavior of persistent current disappears in some cases. In half-filled systems mobility gradually drops to zero with interaction, while it converges to some finite value in non-half-filled cases.7 pages, 6 figuresMesoscale and Nanoscale PhysicsStrongly Correlated Electronstext