title: Kondo resonance in a mesoscopic ring coupled to a quantum dot: exact results for the Aharonov-Bohm-Casher effects.
abstract: We study the persistent currents induced by both the Aharonov-Bohm and Aharonov-Casher effects in a one-dimensional mesoscopic ring coupled to a sidebranch quantum dot at Kondo resonance. For privileged values of the Aharonov-Bohm-Casher fluxes, the problem can be mapped onto an integrable model, exactly solvable by a Bethe ansatz. In the case of a pure magnetic Aharonov-Bohm 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 spin-dependent Aharonov-Casher effect to induce a current which, in the strong-coupling limit, is independent of the number of electrons in the ring.
authors.affiliation: School of Physics, The University of New South Wales, Sydney, 2052, Australia.
authors.forename: H P
authors.initials: HP
authors.lastname: Eckle
authors.forename: H
authors.initials: H
authors.lastname: Johannesson
authors.forename: C A
authors.initials: CA
authors.lastname: Stafford