Transmission through a mesoscopic ring with a quantum dot

Jian Wu; Bing Lin Gu; Junjie Liu; Youjiang Guo; Jia Lin Zhu; Jing Zhi Yu; Yoshiyuki Kawazoe

doi:10.1016/S0375-9601(99)00656-8

Transmission through a mesoscopic ring with a quantum dot

Jian Wu, Bing Lin Gu, Junjie Liu, Youjiang Guo, Jia Lin Zhu, Jing Zhi Yu, Yoshiyuki Kawazoe

New Industry Creation Hatchery Center (NICHe)

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	245-250
Number of pages	6
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	262
Issue number	2-3
DOIs	https://doi.org/10.1016/S0375-9601(99)00656-8
Publication status	Published - 1999 Nov 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1016/S0375-9601(99)00656-8

Cite this

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title = "Transmission through a mesoscopic ring with a quantum dot",

abstract = "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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T1 - Transmission through a mesoscopic ring with a quantum dot

AU - Wu, Jian

AU - Gu, Bing Lin

AU - Liu, Junjie

AU - Guo, Youjiang

AU - Zhu, Jia Lin

AU - Yu, Jing Zhi

AU - Kawazoe, Yoshiyuki

PY - 1999/11/1

Y1 - 1999/11/1

N2 - 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.

AB - 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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Transmission through a mesoscopic ring with a quantum dot

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