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

Journal Article · Mon Jul 02 00:00:00 EDT 2001 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.87.016602· OSTI ID:40204757

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

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.

• Sponsoring Organization: (US)
• OSTI ID: 40204757
• Journal Information: Physical Review Letters, Vol. 87, Issue 1; Other Information: DOI: 10.1103/PhysRevLett.87.016602; Othernumber: PRLTAO000087000001016602000001; 041127PRL; PBD: 2 Jul 2001; ISSN 0031-9007
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONS
RESONANCE
AHARONOV-BOHM EFFECT