Quantum confining excitons with moiré ferroelectrics

Confining optically bright excitons is a long-standing goal to realize strong interacting excitons and quantum light generation. However, unlike electrons which can be readily controlled via electric field, imposing strong nanoscale potential on excitons for quantum confinement has been challenging. Here, we integrate the twisted hBN with the monolayer MoSe₂ and observe strong confinement of the neutral excitons and polarons at the ferroelectric domain boundaries of hBN. This quantum confinement effect is highly dependent on the sizes of the ferroelectric domains. Furthermore, we show evidence that excitons are confined in a one-dimensional fashion along the domain walls. Our results pave the way for studying strongly interacting excitons and photons, and novel ferroelectric control mechanisms for classical and quantum optoelectronics.