Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor

T. Kubo; Y. Tokura; T. Hatano; S. Amaha; S. Teraoka; S. Tarucha

doi:10.1016/j.physe.2009.11.059

Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor

T. Kubo, Y. Tokura, T. Hatano, S. Amaha, S. Teraoka, S. Tarucha

SCI - Physics

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

1 Citation (Scopus)

Abstract

We theoretically investigated the effects of the observation by a quantum dot charge sensor on an Aharonov-Bohm effect in a laterally coupled double quantum dot using the interpolative 2nd-order perturbation theory. In particular, we introduce the notion of the coherent indirect coupling, which characterizes the strength of the indirect coupling between two quantum dots via the reservoir. As the Coulomb interaction V_S for the charge sensing increases, the linear conductance through a double quantum dot decreases because of the many-body correlation effect. The visibility of Aharonov-Bohm oscillation in the linear conductance behaves super-linearly for weak sensing interaction regime and sub-linearly for strong sensing interaction regime.

Original language	English
Pages (from-to)	852-855
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	42
Issue number	4
DOIs	https://doi.org/10.1016/j.physe.2009.11.059
Publication status	Published - 2010 Feb 1

Keywords

Aharonov-Bohm effect
Laterally coupled double quantum dot
Quantum dot charge sensor
Visibility

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1016/j.physe.2009.11.059

Cite this

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title = "Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor",

abstract = "We theoretically investigated the effects of the observation by a quantum dot charge sensor on an Aharonov-Bohm effect in a laterally coupled double quantum dot using the interpolative 2nd-order perturbation theory. In particular, we introduce the notion of the coherent indirect coupling, which characterizes the strength of the indirect coupling between two quantum dots via the reservoir. As the Coulomb interaction VS for the charge sensing increases, the linear conductance through a double quantum dot decreases because of the many-body correlation effect. The visibility of Aharonov-Bohm oscillation in the linear conductance behaves super-linearly for weak sensing interaction regime and sub-linearly for strong sensing interaction regime.",

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T1 - Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor

AU - Kubo, T.

AU - Tokura, Y.

AU - Hatano, T.

AU - Amaha, S.

AU - Teraoka, S.

AU - Tarucha, S.

PY - 2010/2/1

Y1 - 2010/2/1

N2 - We theoretically investigated the effects of the observation by a quantum dot charge sensor on an Aharonov-Bohm effect in a laterally coupled double quantum dot using the interpolative 2nd-order perturbation theory. In particular, we introduce the notion of the coherent indirect coupling, which characterizes the strength of the indirect coupling between two quantum dots via the reservoir. As the Coulomb interaction VS for the charge sensing increases, the linear conductance through a double quantum dot decreases because of the many-body correlation effect. The visibility of Aharonov-Bohm oscillation in the linear conductance behaves super-linearly for weak sensing interaction regime and sub-linearly for strong sensing interaction regime.

AB - We theoretically investigated the effects of the observation by a quantum dot charge sensor on an Aharonov-Bohm effect in a laterally coupled double quantum dot using the interpolative 2nd-order perturbation theory. In particular, we introduce the notion of the coherent indirect coupling, which characterizes the strength of the indirect coupling between two quantum dots via the reservoir. As the Coulomb interaction VS for the charge sensing increases, the linear conductance through a double quantum dot decreases because of the many-body correlation effect. The visibility of Aharonov-Bohm oscillation in the linear conductance behaves super-linearly for weak sensing interaction regime and sub-linearly for strong sensing interaction regime.

KW - Aharonov-Bohm effect

KW - Laterally coupled double quantum dot

KW - Quantum dot charge sensor

KW - Visibility

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JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

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ER -

Effects of observation on quantum interference in a laterally coupled double quantum dot using a quantum dot charge sensor

Abstract

Keywords

ASJC Scopus subject areas

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