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

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

2001-05-22

arxiv.org/abs/cond-mat/0105423v3

Physical Review Letters 86, 5558 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.86.5558

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 $\xi_K^0=\hbar \upsilon _F/T_K^0$ 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.

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