Kondo resonance in a mesoscopic ring coupled to a quantum dot: Exact results for the Aharonov-Bohm-Casher effects - art. no. 016602

We study the persistent currents induced by both the Aharonov-Bohm and Ahar onov-Casher effects in a one-dimensional mesoscopic ring coupled to a sideb ranch quantum dot at Kondo resonance. For privileged values of the Aharonov -Bohm-Casher fluxes, the problem can be mapped onto an integrable model, ex actly solvable by a Bethe ansatz. In the case of a pure magnetic Aharonov-B ohm flux, we find that the presence of the quantum dot has no effect on the persistent current. In contrast, the Kondo resonance interferes with the s pin-dependent Aharonov-Casher effect to induce a current which, in the stro ng-coupling limit, is independent of the number of electrons in the ring.