Fig. 1: Schematic of the system under study.
From: Spatiotemporal dynamics of moiré excitons in van der Waals heterostructures
a A twisted TMD heterostructure is optically excited, creating an initial population of hot excitons (represented by the red contoured and shaded electron-hole pair bubble) with an energy of 60 meV (indicated by the orange plane pointed to by the arrow in the excitonic subband structure). b Spatial distribution of excitons with a 0.5 μm width (red Gaussian). The system undergoes an energy-momentum thermalization (orange arrows connecting red excitons (hot) to blue excitons (cold)), accompanied by time-dependent spatial diffusion, illustrated by the blue arrow denoting the broadening of the spatial exciton distribution (blue Gaussian). Both processes are strongly dependent on twist angle and temperature.
