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Carnot efficiency sets a fundamental upper bound on the heat engineefficiency, attainable in the quasi-static limit, albeit at the cost ofcompletely sacrificing power output. In this Letter, we present a minimal heatengine model that can attain Carnot efficiency while achieving maximum poweroutput. We unveil the potential of intrinsic divergent physical quantitieswithin the working substance, such as degeneracy, as promising thermodynamicresources to break through the universal power-efficiency trade-off imposed bynonequilibrium thermodynamics for conventional heat engines. Our findingsprovide novel insights into the collective advantage in harnessing energy ofmany-body interacting systems.

A Minimal Model for Carnot Efficiency at Maximum Power