# Transport and energetic properties of a ring of interacting spins coupled to heat baths

## TL;DR

This paper investigates how interactions in a spin ring coupled to heat baths influence heat and spin transport, revealing tunable regimes and enhanced ergotropy near avoided crossings.

## Contribution

It demonstrates that interactions induce avoided crossings that can be used to control heat and spin currents, and significantly increase ergotropy in nonequilibrium steady states.

## Key findings

- Heat current can flow clockwise, counter-clockwise, or in parallel depending on interactions.
- Spin current within the ring can be tuned by temperature bias and interactions.
- Ergotropy increases near avoided crossings, enhancing energy extraction potential.

## Abstract

We study the heat and spin transport properties in a ring of interacting spins coupled to heat baths at different temperatures. We show that interactions, by inducing avoided crossings, can be a mean to tune both the total heat current flowing between the ring and the baths, and the way it flows through the system. In particular, we recognize three regimes in which the heat current flows clockwise, counter-clockwise, and in parallel. The temperature bias between the baths also induces a spin current within the ring, whose direction and magnitude can be tuned by the interaction. Lastly, we show how the ergotropy of the nonequilibrium steady state can increase significantly near the avoided crossings.