Exploring excitons in 2D transition metal dichalcogenides (TMDCs)

Linghan Zhu

Exciton is the quasiparticle formed by an excited electron state in the conduction band and the left hole state in the valence band. Excitons dominate the optical properties in many materials, especially in 2D materials where the exciton binding energies are orders magnitude larger than that in the bulk counterparts due to the quantum confinement and reduced dielectric screening. In this talk I will present my recent work on first principle calculations of the optical properties of 2D MoS2 and MoS2/WS2 heterostructure, and what is the effect of lattice vibrations on the exciton states.