Randomized trial explores ultrafast exciton formation in monolayer hexagonal boron nitride, suggesting insights into photonic applications.
Key Points
This research investigates the ultrafast processes involved in exciton formation and dynamics in two-dimensional materials, aiming to elucidate the initial stages.
Used time-dependent density functional theory simulations incorporating long-ranged interactions.
Focused on monolayer hexagonal boron nitride as the material for exploration.
Analyzed exciton formation and dissociation processes within approximately 2.5 femtoseconds.
Excitons form through a three-step process involving generation of free carriers, binding to form an 'exciton core', and evolution to a fully-formed exciton.
Dynamics reveal exciton-exciton interference, leading to oscillatory electron-occupation signals as predicted signatures.
An anisotropic Mott transition occurs when increasing laser intensity into the strong field regime.