Kondo resonance effect on persistent currents through a quantum dot in a mesoscopic ring

Details Kondo resonance effect on persistent currents through a quantum dot in a mesoscopic ring Kondo resonance effect on persistent currents through a quantum dot in a mesoscopic ring

1999-03-22

arxiv.org/abs/cond-mat/9903330v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 Postscript figures

Scientific paper

10.1103/PhysRevLett.82.5088

The persistent current through a quantum dot inserted in a mesoscopic ring of length L is studied. A cluster representing the dot and its vicinity is exactly diagonalized and embedded into the rest of the ring. The Kondo resonance provides a new channel for the current to flow. It is shown that due to scaling properties, the persistent current at the Kondo regime is enhanced relative to the current flowing either when the dot is at resonance or along a perfect ring of same length. In the Kondo regime the current scales as $L^{-1/2}$, unlike the $L^{-1}$ scaling of a perfect ring. We discuss the possibility of detection of the Kondo effect by means of a persistent current measurement.

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