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Transmission through a mesoscopic ring with a quantum dot

โœ Scribed by Jian Wu; Bing-Lin Gu; Junjie Liu; Youjiang Guo; Jia-Lin Zhu; Jing-Zhi Yu; Yoshiyuki Kawazoe

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
89 KB
Volume
262
Category
Article
ISSN
0375-9601

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โœฆ Synopsis

The transmission through a mesoscopic ring with a quantum dot embedded in one of its arms is studied with a one-dimensional scattering model. The quantum dot is approached by a quantum well scatterer. With the use of a scattering matrix describing the junctions between the leads and the ring, it is analytically shown that the quantum interference and the resonant tunneling dominate the transmission. When the state of the dot is far from a resonance, the system acts as a quantum wire with two separated stubs at both ends. However, when a resonant tunneling through the dot occurs, an extra phase shift may be introduced to the wave through the dot and then the quantum interference effect may be flipped. The dependence of the total transmission coefficient on the properties of the quantum dot is also presented.

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