Entropy Current through a Strongly Correlated Plexcitonic Nanojunction

Abstract

We study the entropy current through an excitonic Coulomb blockaded two-level quantum emitter attached to plasmonic metal nanoparticles subjected to a temperature gradient by invoking the noncrossing approximation. We find that boosting the plasmon-exciton coupling enhances the entropy current at any temperature for an infinitesimal bias and temperature gradient, whereas increasing the ambient temperature rapidly suppresses it. Introducing finite temperature gradient serves to increase the entropy current. On the other hand, increasing the bias voltage causes the entropy current to increase slightly around the Kondo temperature for low plasmon-exciton coupling values. Finally, we determine that the entropy current always stays finite at elevated voltage bias values for any nonvanishing plasmon-exciton coupling. We elucidate on the microscopic origin of these intriguing results.