Universal behaviour of Coulomb coupled Fermionic thermal diode

TL;DR

This paper introduces a minimal Coulomb-coupled fermionic quantum dot model that functions as an efficient thermal diode with universal rectification properties, independent of system specifics, at a particular mean transition point.

Contribution

It presents a universal model for a fermionic thermal diode demonstrating complete rectification and identifies a universal optimal heat current condition based on system parameters.

Findings

Achieves complete thermal rectification even with small temperature gradients.

Identifies a universal optimal heat current condition at the mean transition point.

Demonstrates independence of rectification behavior from specific system parameters.

Abstract

We propose a minimal model of a Coulomb coupled fermionic quantum dot thermal diode that can act as an efficient thermal switch and exhibit complete rectification behaviour, even in presence of a small temperature gradient. Using two well defined dimensionless system parameters, universal characteristics of the optimal heat current condition are identified. It is shown to be independent of any system parameter and is obtained only at the mean transitions point "$-0.5$", associated with the equilibrium distribution of the two fermionic reservoirs, tacitly referred to as "$\textit{universal magic mean}$".