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

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