Long-distance coherent tunneling effect on the charge and heat currents in serially coupled triple quantum dots

David M. T. Kuo and Yia-chung Chang

Phys. Rev. B 89, 115416 – Published 14 March 2014

Abstract

The effect of long-distance coherent tunneling (LDCT) on the charge and heat currents in serially coupled triple quantum dots (TQDs) connected to electrodes is illustrated by using a combination of the extended Hurbbard and Anderson models. The charge and heat currents are calculated with a closed-form Landauer expression for the transmission coefficient suitable for the Coulomb blockade regime. The physical parameters including bias-dependent quantum dot energy levels, electron Coulomb interactions, and electron hopping strengths are calculated in the framework of effective mass theory for semiconductor TQDs. We demonstrate that the effect of LDCT on the charge and heat currents can be robust. In addition, it is shown that prominent heat rectification behavior can exist in the TQD system with asymmetrical energy levels.

Received 10 September 2013
Revised 6 March 2014

DOI:https://doi.org/10.1103/PhysRevB.89.115416

Authors & Affiliations

David M. T. Kuo^1,* and Yia-chung Chang^2,3,†

¹Department of Electrical Engineering and Department of Physics, National Central University, Chungli 320, Taiwan
²Research Center for Applied Sciences, Academic Sinica, Taipei 11529, Taiwan
³Department of Physics, National Cheng Kung University, Tainan 701, Taiwan

^*mtkuo@ee.ncu.edu.tw
^†yiachang@gate.sinica.edu.tw

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Vol. 89, Iss. 11 — 15 March 2014

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