Speaker
Description
The present work focuses on coupling semi-classical Boltzmann dynamics with the non-equilibrium Bethe-Salpeter equation in order to describe bound state absorption/emission and intraband relaxation processes occurring in a WS2 monolayer.
The appeal stems from the direct access to the electronic/hole populations and the real-time evolution of the non-equilibrium thermal density matrix including electron-phonon coupling effects and scattering, allowing for the calculation of time-dependent excitonic production/decay rates.
Furthermore, the excitonic spectra are computed at each time-step using density matrix response theory from first principles. It allows for calculation of renormalised quasielectron bandgaps and pronounced screening effects at higher carrier concentrations in the material.
Electron-electron interactions and electron-hole recombination will not be considered, as their dynamics lie out of the femtosecond timescale of electron-phonon interactions.