EQuAL Seminar: RIchen Xiong

"Moire valley excitons: a potential platform for quantum optics"

Quantum optical phenomena are often enriched by their solid-state hosts, like NV centers and micro-cavities. Here I want to propose moire excitons in transition metal dichalcogenides (TMD) heterostructure as a potential solid state platform for quantum optics. These excitons feature strong light-matter interactions, unique valley selection rules, and high tunability with strain or electric field. Furthermore, the moire superlattices flatten the exciton band and give rise to strong correlation between excitons. In this talk I will give some general introductions on excitons and talk about our recent work on discovering a lattice consisting of interlayer excitons and emerging valley magnetism. Then I will discuss opportunities of studying quantum optics with these moire valley excitons, such as entangled photons generation, Dicke superradiance, and topological photonics.