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We study the impact of cooperative many-body effects on the operation ofperiodically-driven quantum thermal machines, particularly heat engines andrefrigerators. In suitable geometries, $N$ two-level atoms can exchange energywith the driving field and the (hot and cold) thermal baths at a faster ratethan a single atom due to their SU(2) symmetry that causes the atoms to behaveas a collective spin-$N/2$ particle. This cooperative effect boosts the poweroutput of heat engines compared to the power output of $N$ independent,incoherent, heat engines. In the refrigeration regime, similar cooling-powerboost takes place.

Cooperative many-body enhancement of quantum thermal machine power