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)
a Department of Physics, Sichuan University, Chengdu 610064, China; b Center of Theoretical Nuclear Physics of Heavy Ion Facilities of Lanzhou, Lanzhou 730000, China
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.
Received: 06 December 2006
Revised: 15 December 2006
Accepted manuscript online:
Fund: 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
Cite this article:
Chen Ming-Lun(陈明伦) and Wang Shun-Jin(王顺金) The transport properties in an Aharonov--Bohm interferometer with a quantum dot 2007 Chinese Physics 16 2101
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