Giant Kondo Resonance of Parallel-Coupled Double Quantum Dots Embedded in an A-B Ring

We theoretically study the properties of the ground state of the parallel-coupled double quantum dots embedded in a mesoscopic ring in the Kondo regime by means of the two-impurity Anderson Hamiltonian. The Hamiltonian is solved by means of the slave-boson mean-field theory. We find that in this sys...

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Bibliographic Details
Published inCommunications in theoretical physics Vol. 46; no. 2; pp. 343 - 347
Main Author CHEN Xiong-Wen HE Da-Jiang SONG Ke-Hui WU Shao-Quan
Format Journal Article
LanguageEnglish
Published IOP Publishing 15.08.2006
Subjects
Kondo效应
双量子点
奇偶性效应
稳定流
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Summary:We theoretically study the properties of the ground state of the parallel-coupled double quantum dots embedded in a mesoscopic ring in the Kondo regime by means of the two-impurity Anderson Hamiltonian. The Hamiltonian is solved by means of the slave-boson mean-field theory. We find that in this system, the persistent current depends sensitively on both the parity of this system and the size of the ring. In the strong coupling regime, the giant sharp current peak appears, at the same time, the parity dependence of the persistent current disappears. These imply that in the strong coupling regime, there exists giant Kondo resonance and the two dots can be coupled coherently. Thus this system might be a candidate for future device applications.
Bibliography:11-2592/O3
persistent current, double quantum dot, parity effect, Kondo effect
O413
ISSN:0253-6102
DOI:10.1088/0253-6102/46/2/032