Mesoscopic Kondo screening effect in a single-electron transistor embedded in a metallic ring

Abstract

We study the Kondo screening effect generated by a single-electron transistor or quantum dot embedded in a small metallic ring. When the ring circumference $L$ becomes comparable to the fundamental length scale ${\xi }_K^0=\hslash {\upsilon }_F/T_K^0$ associated with the {\it bulk} Kondo tempe the Kondo resonance is strongly affected, depending on the total number of electrons ({\it modulo} 4) and magnetic flux threading the ring. The resulting Kondo-assisted persistent currents are also calculated in both Kondo and mixed valence regimes, and the maximum values are found in the crossover region.

4 pages, Revtex, 6 figures, more references are included

References in corpus (1)

• Detecting the Kondo screening cloud around a quantum dot

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