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Open Access Nano Idea

Thermoelectric effect in an Aharonov-Bohm ring with an embedded quantum dot

Jun Zheng1, Feng Chi2*, Xiao-Dong Lu2 and Kai-Cheng Zhang3

Author Affiliations

1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

2 College of Engineering, Bohai University, Jinzhou 121013, China

3 Department of Physics, Bohai University, Jinzhou 121000, China

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Nanoscale Research Letters 2012, 7:157  doi:10.1186/1556-276X-7-157

Published: 28 February 2012

Abstract

Thermoelectric effect is studied in an Aharonov-Bohm interferometer with an embedded quantum dot (QD) in the Coulomb blockade regime. The electrical conductance, electron thermal conductance, thermopower, and thermoelectric figure-of-merit are calculated by using the Keldysh Green's function method. It is found that the figure-of-merit ZT of the QD ring may be quite high due to the Fano effect originated from the quantum interference effect. Moreover, the thermoelectric efficiency is sensitive to the magnitude of the dot-lead and inter-lead coupling strengthes. The effect of intradot Coulomb repulsion on ZT is significant in the weak-coupling regime, and then large ZT values can be obtained at rather high temperature.