# Reversible thermal diode and energy harvester with a superconducting quantum interference single-electron transistor

## TL;DR

This paper presents a superconducting quantum interference single-electron transistor that functions as a reversible thermal diode and energy harvester, controllable via magnetic flux and gate voltage, with potential applications in thermal management and energy conversion.

## Contribution

It introduces a novel device leveraging proximitized nanowires and superconducting rings to achieve tunable charge and heat rectification with reversible polarity.

## Key findings

- The device acts as a diode for charge and heat currents.
- Magnetic flux and gate voltage control diode polarity.
- Dissipation and phonon coupling enhance rectification and enable heat-to-electrical conversion.

## Abstract

The density of states of proximitized normal nanowires interrupting superconducting rings can be tuned by the magnetic flux piercing the loop. Using these as the contacts of a single-electron transistor allows to control the energetic mirror asymmetry of the conductor, this way introducing rectification properties. In particular, we show that the system works as a diode that rectifies both charge and heat currents and whose polarity can be reversed by the magnetic field and a gate voltage. We emphasize the role of dissipation at the island. The coupling to substrate phonons enhances the effect and furthermore introduces a channel for phase tunable conversion of heat exchanged with the environment into electrical current.