Fig. 1: Setup.
From: Beating Carnot efficiency with periodically driven chiral conductors
a Schematic of periodically driven chiral engine. In the hot bath, an AC field is selectively applied only to the electrons directed towards the working substance. The working substance is composed of a scatterer whose transmission probability has an arbitrary energy dependence. b An implementation using a chiral conductor with a localized energy level. A time-dependent AC voltage \({{{{{{{{\mathcal{V}}}}}}}}}_{{{{{{{{\rm{ac}}}}}}}}}(t)\) is applied only to the lower left reservoir, hence realizing the selective AC driving. Edge channels from left and right reservoir are tunnel coupled to the localized state. The hot left reservoirs (cold right reservoir) have temperature θL(R) and chemical potential μL(R).
