Thermoelectric transport properties of a T-shaped double quantum dot system in the Coulomb blockade regime

TL;DR

This study explores the thermoelectric behavior of a T-shaped double quantum dot system, revealing how Fano resonances in the Coulomb blockade regime can significantly enhance thermoelectric efficiency.

Contribution

It provides a numerical analysis of thermoelectric properties considering Coulomb interactions and Fano resonances, highlighting mechanisms to improve the figure of merit in quantum dot systems.

Findings

Fano resonances cause strong violation of Wiedemann-Franz law.

Enhanced thermoelectric figure of merit (ZT) observed due to Coulomb interactions.

Thermoelectric parameters are numerically estimated using Green's function formalism.

Abstract

We investigate the thermoelectric properties of a T-shaped double quantum dot system described by a generalized Anderson Hamiltonian. The system's electrical conduction (G) and the fundamental thermoelectric parameters such as the Seebeck coefficient ($S$) and the thermal conductivity ($\kappa$), along with the system's thermoelectric figure of merit (ZT) are numerically estimated based on a Green's function formalism that includes contributions up to the Hartree-Fock level. Our results account for finite onsite Coulomb interaction terms in both component quantum dots and discuss various ways leading to an enhanced thermoelectric figure of merit for the system. We demonstrate that the presence of Fano resonances in the Coulomb blockade regime is responsible for a strong violation of the Wiedemann-Franz law and a considerable enhancement of the system's figure of merit ($ZT$).