Scaling Analysis for Kondo Effect in Quantum Dot Embedded in Aharonov-Bohm Ring(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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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 T_K and conductance at temperatures T≫T_K. We show that T_K 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.
- 2008-12-15
著者
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Eto Mikio
Faculty Of Science And Technology Keio University
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Yoshii Ryosuke
Faculty Of Science And Technology Keio University
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ETO Mikio
Faculty of Science and Technology, Keio University
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