Mesoscopic Kondo effect of a quantum dot embedded in an Aharonov-Bohm ring with intradot spin-flip scattering

We study the Kondo effect in a quantum dot embedded in a mesoscopic ring taking into account the intradot spin-flip scattering R. Based on the finite-U slave-boson mean-field approach, we find that the Kondo peak in the density of states is split into two peaks by this coherent spin-flip transition, which is responsible for some interesting features of the Kondo-assisted persistent current circulating the ring: 1) strong suppression and crossover to a sine function form with increasing R; 2) appearance of a 'hump' in the R-dependent behavior for odd parity. R-induced reverse of the persistent current direction is also observed for odd parity.