Special CPM Seminar

Exciton many body interactions in two-dimensional semiconductors

Xiaoyang Zhu

Columbia University

Exciton-exciton interaction is central to a broad range of many-body processes. Such many-body interactions are particularly strong in two-dimensional (2D) semiconductors due to the poorly screened Coulomb potential. In this talk, I will discuss our recent efforts in understanding exciton-exciton interaction at the 2D limit. Using transition metal dichalcogenides (TMDC) monolayers and hetero-bilayers as model systems, I will discuss moiré exciton lattices, Mott transitions, and spin-valley specific band renormalization. I will also discuss the prospects of quantum fluid phases, such as exciton condensates and 2D superconductivity.