# Electrothermal Transistor Effect and Cyclic Electronic Currents in Multithermal Charge Transfer Networks

## TL;DR

This paper develops a theory for coupled energy and charge transport in multithermal networks, revealing unique phenomena like thermal transistor effects and cyclic currents driven by temperature gradients, beyond standard thermoelectric models.

## Contribution

It introduces a novel theoretical framework for understanding heat-charge coupling in heterogeneous environments, enabling control of electronic currents via temperature gradients.

## Key findings

- Coupled heat and charge transfer lead to exotic transport phenomena.
- Thermal transistor amplification can be tuned by temperature gradients.
- Cyclical electronic currents are controllable in multithermal networks.

## Abstract

A theory is developed to describe the coupled transport of energy and charge in networks of electron donor-acceptor sites which are seated in a thermally heterogeneous environment, where the transfer kinetics are dominated by Marcus-type hopping rates. It is found that the coupling of heat and charge transfer in such systems gives rise to exotic transport phenomena which are absent in thermally homogeneous systems and cannot be described by standard thermoelectric relations. Specifically, the directionality and extent of thermal transistor amplification and cyclical electronic currents in a given network can be controlled by tuning the underlying temperature gradient in the system. The application of these findings toward optimal control of multithermal currents is illustrated on a paradigmatic nanostructure.