The confluence of fractured resonances at points of dynamical, many--body flare

Abstract

Resonant transport occurs when there is a matching of frequencies across some spatial medium, increasing the efficiency of shuttling particles from one reservoir to another. We demonstrate that in a periodically driven, many--body titled lattice there are sets of spatially fractured resonances. These ``emanate'' from two essential resonances due to scattering off internal surfaces created when the driving frequency and many--body interaction strength vary, a scattering reminiscent of lens flare. The confluence of these fractured resonances dramatically enhances transport. At one confluence, the interaction strength is finite and the essential resonance arises due to the interplay of interaction with the counter--rotating terms of the periodic drive. The other forms where several paths split by the many--body interaction merge in the non--interacting limit. We discuss the origin and structure of the fractured resonances, as well as the scaling of the conductance on system parameters. These results furnish a new example of the richness of open, driven, many--body systems.Comment: comments welcome