Thermovoltage and heat dissipation in a triangle quantum dot junction

TL;DR

This paper numerically studies thermoelectric effects in a triangle quantum dot junction, revealing nonlinear behaviors and controllable thermovoltage, thermocurrent, and heat dissipation for nanoscale device optimization.

Contribution

It introduces a detailed numerical analysis of thermoelectric properties in a triangle quantum dot system using the non-equilibrium Green's function method, highlighting controllable nonlinear effects.

Findings

Thermovoltage and thermocurrent exhibit nonlinear behavior.

Heat current is nonlinear and asymmetric with respect to bias voltage.

Heat current can be positive, negative, or zero depending on bias and site energies.

Abstract

We numerically investigate the thermoelectric properties of a triangle quantum dot connected to metallic electrodes using the non-equilibrium Green's function method in the Anderson model. Exploiting the equation of motion method in the Coulomb-blockade regime, the thermovoltage, thermocurrent and heat dissipation are calculated. Results show that the thermovoltage and thermocurrent have nonlinear behavior, and the magnitude and sign of them can be controlled with site energy and coupling strength of quantum dots. Moreover, we find that the heat current is nonlinear and asymmetric respect to the sign of bias voltage for all of the site energies of quantum dots. Analyses show that the heat current can be positive or negative for all of the site energies and becomes zero for the nonzero voltages. These results can be useful to determine the performance of the nanoscale electronic devices to control the heat dissipations.