Kondo Resonance in a Mesoscopic Ring Coupled to a Quantum Dot: Exact Results for the Aharonov-Bohm-Casher Effects

H.-P. Eckle; H. Johannesson; C. A. Stafford

doi:10.1103/PhysRevLett.87.016602

Kondo Resonance in a Mesoscopic Ring Coupled to a Quantum Dot: Exact Results for the Aharonov-Bohm-Casher Effects

H.-P. Eckle, H. Johannesson, and C. A. Stafford

Phys. Rev. Lett. 87, 016602 – Published 19 June 2001

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.

Received 5 October 2000

DOI:https://doi.org/10.1103/PhysRevLett.87.016602

Authors & Affiliations

H.-P. Eckle^1,2, H. Johannesson³, and C. A. Stafford⁴

¹School of Physics, The University of New South Wales, Sydney, 2052, Australia
²Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
³Institute of Theoretical Physics, Chalmers University of Technology and Göteborg University, SE 412 96 Göteborg, Sweden
⁴Department of Physics, University of Arizona, 1118 E. 4th Street, Tucson, Arizona 85721