Abstract: Moiré superlattices in two-dimensional (2D) materials represent a highly promising platform for uncovering and controlling novel quantum phenomena. The robust excitonic responses observed in transition metal dichalcogenides (TMDs) provide a powerful means to optically probe and manipulate these interactions. In this presentation, I will demonstrate the intricate interplay between excitons and charge carriers confined within moiré potentials, showcasing how the precise engineering of 2D materials into supermoiré lattices can systematically control these interactions. This control leads to the emergence of exotic quasiparticles. Specifically, we reveal the behavior of interlayer valley excitons in bichromatic TMD moiré trilayers, where periodic superlattices create tunable multiple orbital configurations. The synergy between the tunable potential landscape and the layer degree of freedom enables the formation of interlayer quadrupolar moiré trions. These findings establish a foundation for the development of electrically tunable, multi-orbital moiré potentials, unlocking new avenues for the discovery and exploration of new quantum phases in 2D materials.

Bio: Xi Wang earned her BS in Physics from the University of Science and Technology of China (USTC). She completed her Ph.D. at Florida State University. As an EFRC Postdoctoral Fellow in the Physics Department at the University of Washington, Seattle, she worked with Prof. Xiaodong Xu and Prof. Daniel Gamelin. Xi joined the Department of Physics at Washington University in St. Louis in January 2024. Her research focused on designing, fabricating, and characterizing high-quality heterostructures made from two-dimensional materials, with a particular emphasis on excitonic-related quantum many-body interactions in moiré superlattices. She is a recipient of the 2024 Ralph E. Powe Junior Faculty Enhancement Award.