中国物理B ›› 2004, Vol. 13 ›› Issue (2): 225-228.doi: 10.1088/1009-1963/13/2/017

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The persistent current in an Aharonov－Bohm ring with a side-coupled quantum dot

周波, 吴绍全, 孙威立, 周晓林   

  1. Department of Physics, Sichuan Normal University, Chengdu 610066, China
  • 收稿日期:2003-03-21 修回日期:2003-08-18 出版日期:2004-02-06 发布日期:2005-07-06

The persistent current in an Aharonov－Bohm ring with a side-coupled quantum dot

Zhou Bo (周波), Wu Shao-Quan (吴绍全), Sun Wei-Li (孙威立), Zhou Xiao-Lin (周晓林)   

  1. Department of Physics, Sichuan Normal University, Chengdu 610066, China
  • Received:2003-03-21 Revised:2003-08-18 Online:2004-02-06 Published:2005-07-06

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摘要： We have investigated the persistent current in a mesoscopic ring with a side-coupled quantum dot. The problems are probed by using the one-impurity Anderson Hamiltonian and are treated with the slave boson mean field theory. It is shown that the persistent current in this system has the spin fluctuations, and the charge transfers between the two subsystems are suppressed in the limit of Δ/T_K^0《1. The minimum value of the persistent current for ξ_K/L=5 of the odd parity system provides an opportunity to detect the Kondo screening cloud.

关键词: quantum dot, Kondo effect, persistent current, Kondo screening cloud

Abstract: We have investigated the persistent current in a mesoscopic ring with a side-coupled quantum dot. The problems are probed by using the one-impurity Anderson Hamiltonian and are treated with the slave boson mean field theory. It is shown that the persistent current in this system has the spin fluctuations, and the charge transfers between the two subsystems are suppressed in the limit of $\varDelta/T_{\rm K}^0\ll 1$. The minimum value of the persistent current for $\xi_{\rm K}/L=5$ of the odd parity system provides an opportunity to detect the Kondo screening cloud.

Key words: quantum dot, Kondo effect, persistent current, Kondo screening cloud

中图分类号:  (Quantum dots)

  • 73.21.La
71.55.-i (Impurity and defect levels) 72.10.Fk (Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)) 73.23.Ra (Persistent currents)