Light emitters within two-dimensional arrays have been demonstrated to exhibit various cooperative effects, including super- and sub-radiance, collective line-shift and linewidth, and topological features such as Chern bands and edge states. Motivated by these intriguing properties, the realization of emitter arrays has been attempted in cold atom experiments, which nevertheless cannot access the deep subwavelength regime. In this talk, we propose excitons in moire' transition metal dichalcogenide bilayers as a candidate platform to simulate subwavelength arrays of emitters and discuss their collective properties. In addition, we find these superlattices exhibit distinct cooperative features at different charge-ordered states appearing at the corresponding electron filling fractions. Our results demonstrate these moire' bilayer systems as promising quantum simulators for collective phenomena from emitter arrays.

Pizza and drinks will be served after the seminar in ATL 2117.