Enhancing of nonlinear thermoelectric response of a correlated quantum dot in the Kondo regime by asymmetrically coupling to the leads

TL;DR

This paper investigates how asymmetric coupling in a correlated quantum dot enhances the nonlinear thermoelectric response in the Kondo regime, revealing nearly tenfold increases in response compared to symmetric setups.

Contribution

It demonstrates that large asymmetries in lead couplings significantly boost the thermoelectric response in a Kondo-regime quantum dot, a novel insight for thermoelectric device design.

Findings

Response is significantly enhanced with large asymmetries.

Maximum response nearly ten times higher than symmetric cases.

Enhancement observed across a range of voltages and temperatures.

Abstract

We study the low temperature properties of the differential response of the current to a temperature gradient at finite voltage in a single level quantum dot including electron-electron interaction, non-symmetric couplings to the leads and non-linear effects. The calculated response is significantly enhanced in setups with large asymmetries between the tunnel couplings. In the investigated range of voltages and temperatures with corresponding energies up to several times the Kondo energy scale, the maximum response is enhanced nearly an order of magnitude with respect to symmetric coupling to the leads.