The transport properties in an Aharonov--Bohm interferometer with a quantum dot |
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Authors: | Chen Ming-Lun and Wang Shun-Jin |
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Institution: | Department of Physics, Sichuan University, Chengdu 610064, China; Center of Theoretical Nuclear Physics of Heavy Ion Facilities of Lanzhou, Lanzhou 730000, China |
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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. |
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Keywords: | Aharonov--Bohm
interferometer quantum dot Fano
effect Kondo effect |
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