Giant Persistent Current in a Mesoscopic Ring with Parallel-Coupled Double Quantum Dots
CHEN Xiong-Wen1 , WU Shao-Quan1 , WANG Peng2 , SUN Wei-Li1
1 Department of Physics, Sichuan Normal University, Chengdu 610068
2 Institute of Modern Physics, Southwest Jiaotong University, Chengdu 610031
Giant Persistent Current in a Mesoscopic Ring with Parallel-Coupled Double Quantum Dots
CHEN Xiong-Wen1 ;WU Shao-Quan1 ;WANG Peng2 ;SUN Wei-Li1
1 Department of Physics, Sichuan Normal University, Chengdu 610068
2 Institute of Modern Physics, Southwest Jiaotong University, Chengdu 610031
关键词 ：
72.10.Fk ,
72.15.Qm ,
73.23.Ra
Abstract ： 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. Our results show that in this system, the persistent current depends sensitively on both the parity of this system and the size of the ring. Two dots can be coupled coherently, which is reflected in the giant current peak in the strong coupling regime. This system might be a candidate for future device applications.
Key words ：
72.10.Fk
72.15.Qm
73.23.Ra
出版日期: 2004-05-01
:
72.10.Fk
(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
72.15.Qm
(Scattering mechanisms and Kondo effect)
73.23.Ra
(Persistent currents)
引用本文:
CHEN Xiong-Wen;WU Shao-Quan;WANG Peng;SUN Wei-Li. Giant Persistent Current in a Mesoscopic Ring with Parallel-Coupled Double Quantum Dots[J]. 中国物理快报, 2004, 21(5): 911-914.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2004/V21/I5/911
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2004, Vol. 21 
