Shot noise in electron transport through a double quantum dot： a master equation approach

We study shot noise in tunneling current through a double quantum dot connected to two electric leads. We derive two master equations in the occupation-state basis and the eigenstate basis to describe the electron dynamics. The approach based on the occupation-state basis, despite being widely used...

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Bibliographic Details
Published in:Chinese physics B 2010-05, Vol.19 (5), p.195-204, Article 050519
Main Author: 欧阳仕华 林志恒 游建强
Format: Article
Language:English
Subjects:
Dynamics
Electron transport
Energy use
Joining
Mathematical analysis
Mathematical models
Quantum dots
Shot noise
主方程
双量子点
噪声性能
性能预测
耦合强度
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Summary:We study shot noise in tunneling current through a double quantum dot connected to two electric leads. We derive two master equations in the occupation-state basis and the eigenstate basis to describe the electron dynamics. The approach based on the occupation-state basis, despite being widely used in many previous studies, is valid only when the interdot coupling strength is much smaller than the energy difference between the two dots. In contrast, the calculations using the eigenstate basis are valid for an arbitrary interdot coupling. Using realistic model parameters, we demonstrate that the predicted currents and shot-noise properties from the two approaches are significantly different when the interdot coupling is not small. Furthermore, properties of the shot noise predicted using the eigenstate basis successfully reproduce qualitative features found in a recent experiment.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/5/050519