The Kondo effect is theoretically studied in a quantum dot embedded in an Aharonov-Bohm (AB) ring when the size of the ring is much smaller than the Kondo cloud. First, we construct an equivalent model in which a quantum dot is coupled to a single lead. The AB interference effect is involved in the magnetic-flux dependence of the density of states in the lead. The scaling analysis of this model yields analytical expressions for the Kondo temperature TK and conductance at temperatures T ≫ TK. We show that TK may be significantly modulated by the magnetic flux penetrating the ring. Our method is generally applicable to the investigation of the Kondo effect in mesoscopic complex systems including a quantum dot.
|ジャーナル||Journal of the Physical Society of Japan|
|出版ステータス||Published - 2008 12月|
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