title: 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(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.
authors: Department of Physics, Tsinghua University, Beijing 100084, China.
authors: H
authors: H
authors: Hu
authors: G M
authors: GM
authors: Zhang
authors: L
authors: L
authors: Yu