Intercomponent Interaction Induced Dynamical Delocalization in Quantum Kicked Rotors

Unlike classical kicked rotors that exhibit chaotic diffusion, quantum kicked rotors display dynamical localization arising from quantum interference. Previous studies have shown that interaction can break this localization, but its effects in multi-component condensates remain largely unexplored. Here, using Gross–Pitaevskii simulations of a two-component Bose–Einstein condensate where only one component is periodically kicked, we show that onsite inter-component interactions transform two otherwise localized subsystems into a delocalized state in momentum space, akin to coupling two interacting insulators to produce a metallic state. Moreover, rather than being coherently dragged by the unperturbed component, the inter-component interaction induces a stronger breakdown of dynamical localization compared to the case in kicked single-component BEC. A reduced tight-binding model reproduces these features and provides a microscopic picture responsible for the onset of transport. Our results highlight a complementary pathway to delocalization in momentum-space lattices, where interactions between different components control the transition between localized and extended phases.