中国物理B ›› 2007, Vol. 16 ›› Issue (7): 2101-2105.doi: 10.1088/1009-1963/16/7/050

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The transport properties in an Aharonov--Bohm interferometer with a quantum dot

陈明伦1, 王顺金2   

  1. (1)Department of Physics, Sichuan University, Chengdu 610064, China; (2)Department of Physics, Sichuan University, Chengdu 610064, China;Center of Theoretical Nuclear Physics of Heavy Ion Facilities of Lanzhou, Lanzhou 730000, China
  • 收稿日期:2006-12-06 修回日期:2006-12-15 出版日期:2007-07-20 发布日期:2007-07-04
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos~10375039 and 90503008), the Doctoral Fund of Ministry of Education of China, and partly by the Center of Theoretical Nuclear Physics of Heavy Ion Research Facilities of Lanz

The transport properties in an Aharonov--Bohm interferometer with a quantum dot

Chen Ming-Lun(陈明伦)a) and Wang Shun-Jin(王顺金)a)b)   

  1. a Department of Physics, Sichuan University, Chengdu 610064, China; b Center of Theoretical Nuclear Physics of Heavy Ion Facilities of Lanzhou, Lanzhou 730000, China
  • Received:2006-12-06 Revised:2006-12-15 Online:2007-07-20 Published:2007-07-04
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos~10375039 and 90503008), the Doctoral Fund of Ministry of Education of China, and partly by the Center of Theoretical Nuclear Physics of Heavy Ion Research Facilities of Lanz

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摘要： This paper investigates the electronic transport properties in an Aharonov--Bohm interferometer with a quantum dot coupling to left and right electrodes. By employing cluster expansions, it transforms the equations of motion of Green's functions into the corresponding equation of motion of connected Green's functions, which provides a natural and uniform truncation scheme. With this method under the Lacroix's truncation approximation, it shows that the asymmetric line shape of zero bias conductance manifests itself as the Fano effect, and the Kondo effect has been observed in the narrow peak of differential conductance curve of the system. Our numerical results also show that the building of Fano state suppresses the amplitude of Kondo resonance.

关键词: Aharonov--Bohm interferometer, quantum dot, Fano effect, Kondo effect

Abstract: This paper investigates the electronic transport properties in an Aharonov--Bohm interferometer with a quantum dot coupling to left and right electrodes. By employing cluster expansions, it transforms the equations of motion of Green's functions into the corresponding equation of motion of connected Green's functions, which provides a natural and uniform truncation scheme. With this method under the Lacroix's truncation approximation, it shows that the asymmetric line shape of zero bias conductance manifests itself as the Fano effect, and the Kondo effect has been observed in the narrow peak of differential conductance curve of the system. Our numerical results also show that the building of Fano state suppresses the amplitude of Kondo resonance.

Key words: Aharonov--Bohm interferometer, quantum dot, Fano effect, Kondo effect

中图分类号:  (Quantum dots)

  • 73.63.Kv
73.21.La (Quantum dots)