Jack Engdahl, UNSW
Excitons are bound states of electrons and holes that can dramatically influence the optical properties of 2D materials, such as TMDs including MoS2. It is well known that the band gap in 2D TMDs is dramatically renormalized by doping, but the exciton resonance measured optically is generally reported to be unchanged.
In this theoretical work we investigate multiple corrections to the exciton resonance in MoS2 and find that there is a dramatic shift in this resonance from an ideal insulator to a slightly doped system before this correction saturates and the position of the resonance remains constant. We extend the principles of this work to investigate the band gap renormalization in bilayer graphene and find electron-electron interactions leads to a dramatic band gap renormalization at low densities.
About the presenter
Jack is a PhD candidate in CI Oleg Sushkov‘s group. His project aims to establish a theoretical groundwork for magnetohydrodynamics in 2D electron fluids using periodic micromagnets. This work fits the FLEET Enabling Research Theme 1, Topological Materials.