Nonequilibrium transport in T-shaped double quantum dots: Phonon emission without dephasing

Akiko Ueda; Mikio Eto

doi:10.1016/j.physe.2007.09.156

Nonequilibrium transport in T-shaped double quantum dots: Phonon emission without dephasing

Akiko Ueda, Mikio Eto

Department of Physics

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

We theoretically study the effect of electron-phonon interaction on transport properties in T-shaped double quantum dots, in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). Nonequilibrium transport under finite bias is calculated using Keldysh Green function method. The differential conductance shows a dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot antibonding orbital. The phonon emission from dot 2 breaks the interference and reduces the dip in size. The phonon emission from dot 1, on the other hand, does not affect the interference at all. An experiment to observe this dephasing-free phonon emission is proposed.

Original language	English
Pages (from-to)	1602-1604
Number of pages	3
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	40
Issue number	5
DOIs	https://doi.org/10.1016/j.physe.2007.09.156
Publication status	Published - 2008 Mar 1

Keywords

Dephasing
Electron-phonon interaction
Nonequilibrium transport
Quantum dot

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.2007.09.156

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Ueda, A., & Eto, M. (2008). Nonequilibrium transport in T-shaped double quantum dots: Phonon emission without dephasing. Physica E: Low-Dimensional Systems and Nanostructures, 40(5), 1602-1604. https://doi.org/10.1016/j.physe.2007.09.156

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abstract = "We theoretically study the effect of electron-phonon interaction on transport properties in T-shaped double quantum dots, in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). Nonequilibrium transport under finite bias is calculated using Keldysh Green function method. The differential conductance shows a dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot antibonding orbital. The phonon emission from dot 2 breaks the interference and reduces the dip in size. The phonon emission from dot 1, on the other hand, does not affect the interference at all. An experiment to observe this dephasing-free phonon emission is proposed.",

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AB - We theoretically study the effect of electron-phonon interaction on transport properties in T-shaped double quantum dots, in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). Nonequilibrium transport under finite bias is calculated using Keldysh Green function method. The differential conductance shows a dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot antibonding orbital. The phonon emission from dot 2 breaks the interference and reduces the dip in size. The phonon emission from dot 1, on the other hand, does not affect the interference at all. An experiment to observe this dephasing-free phonon emission is proposed.

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