# Strained graphene based highly efficient quantum heat engine operating at maximum power

## TL;DR

This paper proposes a strained graphene monolayer as a highly efficient quantum heat engine that operates at maximum power, leveraging valley separation to enhance thermoelectric performance and also functioning as a refrigerator.

## Contribution

It introduces a novel strained graphene-based quantum heat engine with superior efficiency and power, exploiting valley polarization for improved thermoelectric properties.

## Key findings

- Exceeds recent quantum heat engine efficiencies
- Achieves high Seebeck coefficient with increased strain
- Can operate as a high-performance refrigerator

## Abstract

A strained graphene monolayer is shown to operate as a highly efficient quantum heat engine delivering maximum power. The efficiency and power of the proposed device exceeds that of recent proposals. The reason for these excellent characteristics is that strain enables complete valley separation in transmittance through the device, implying that increasing strain leads to very high Seebeck coefficient as well as lower conductance. In addition, since time-reversal symmetry is unbroken in our system, the proposed strained graphene quantum heat engine can also act as a high performance refrigerator.