Mesoscopic Kondo effect in an Aharonov-Bohm ring

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An interacting quantum dot inserted in a mesoscopic ring is investigated. A variational ansatz is employed to describe the ground state of the system in the presence of the Aharonov-Bohm flux. It is shown that, for an even number of electrons with the energy level spacing smaller than the Kondo temperature. the persistent current has a value similar to that of a perfect ring with the same radius. On the Ether hand, for a ring with an odd number of electrons, the persistent current is found to be strongly suppressed compared to that of an ideal ring, which implies the suppression of the Kondo-resonant transmission. Various aspects of the Kondo-assisted persistent current are discussed.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2000-12
Language
English
Article Type
Article
Keywords

SINGLE-ELECTRON TRANSISTOR; ZERO-BIAS ANOMALIES; QUANTUM-DOT; ANDERSON MODEL; MAGNETIC-FIELD; TRANSPORT; IMPURITY; RESONANCE; EQUILIBRIUM

Citation

PHYSICAL REVIEW LETTERS, v.85, no.26, pp.5619 - 5622

ISSN
0031-9007
URI
http://hdl.handle.net/10203/13242
Appears in Collection
RIMS Journal Papers
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