The strong modulation limit of excitons and trions in moiré materials

The optical properties of weakly-doped two-dimensional materials are dominated by strong exciton and trion absorption and luminescence features. In this talk I will discuss the influence of moiré patterns in semiconductor heterobilayers on exciton and trion states in the limit of strong moiré modulation potentials, commenting on similarities and differences compared to the case of excitons and trions in semiconductor quantum dots. One important difference in the moiré case is the regular spatial arrangement of trapping centers, which gives rise to exciton bands that can be tuned between narrow-band and nearly-free-exciton limits. I will also discuss strategies for using optical properties as quantitative probes of moiré materials, and the prospects for exploiting moiré materials to design unique light emitters.