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Interlayer excitons in two dimensional semiconductor heterostructures showsuppressed electron-hole overlap resulting in longer radiative lifetimes ascompared to intralyer excitons. Such tightly bound interlayer excitons arerelevant for important optoelectronic applications including light storage andquantum communication. Their optical accessibility is, however, limited due totheir out-of-plane transition dipole moment. In this work, we design a CMOScompatible photonic integrated chip platform for enhanced near field couplingof these interlayer excitons with the whispering gallery modes of amicroresonator, exploiting the high confinement of light in a small modalvolume and high quality factor of the system. Our platform allows for highlyselective emission routing via engineering an asymmetric light transmissionwhich facilitates efficient readout and channeling of the excitonic valleystate from such systems.

A photonic integrated chip platform for interlayer exciton valley routing