Dark-state optical potential barriers with nanoscale spacing

Optical potentials have been a versatile tool for the study of atomic motions andmany-body interactions in cold atoms. Recently, optical subwavelength single barriers were proposed to enhance the atomic interaction energy scale, which is based on nonadiabatic corrections to Born-Oppenheimer potentials. Here we present a study for creating an alternative landscape of nonadiabatic potentials-multiple barriers with subwavelength spacing at tens of nanometers. To realize these potentials, spatially rapid-varying dark states of atomic Lambda configurations are formed by controlling the spatial intensities of the driving lasers. As an application, we show that bound states of very long lifetimes on the order of seconds can be realized. Imperfections and experimental realizations of the multiple barriers are also discussed.