Persistent currents at the nanoscale by reservoir engineering.

Keck M., Fazio R., Rossini D.

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We study the emergence of coherent particle currents in a chain of coupled QED cavities, in contact with a structured reservoir. We show that persistent currents can be induced not only by magnetic fluxes at a Hamiltonian level, but also through a suitable engineering of the system-bath coupling. This mechanism is based on the extension to the many-body scenario of a proposal recently put forward by Metelmann and Clerk [Phys. Rev. X 5, 021025 (2015)]. Namely, non-reciprocity can be generated by suitably balancing coherent interactions with their corresponding dissipative version, induced by the coupling to a common structured environment, such to make total interactions directional.

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