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

TL;DR

This paper investigates how long distance coherent tunneling influences charge and heat transport in serially coupled triple quantum dots, revealing robust effects and potential for heat rectification in asymmetric systems.

Contribution

It introduces a combined theoretical approach to analyze LDCT effects on charge and heat currents in TQDs, highlighting the robustness and rectification capabilities.

Findings

LDCT significantly affects charge and heat currents.

Heat rectification can occur in asymmetric TQDs.

The effects are robust across parameter variations.

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 model and Anderson model. 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.