Mesoscopic Kondo screening effect in a single-electron transistor embedded in a metallic ring. |
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Authors: | H Hu G M Zhang L Yu |
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Institution: | Department of Physics, Tsinghua University, Beijing 100084, China. |
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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(0)(K) = Planck's constant over upsilon(F)/T(0)(K) associated with the bulk Kondo temperature, the Kondo resonance is strongly affected, depending on the total number of electrons (mod4) 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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