Fig. 2: Spatial distribution time evolution.
From: Spatiotemporal dynamics of moiré excitons in van der Waals heterostructures
Time-dependent real-space cuts along the x direction (Rx) of the exciton distribution in an hBN-encapsulated WSe2-MoSe2 heterostructure for a twist angle of 3° and at a temperature of (a) 10 K and (b) 70 K. Insets show the variance σ2 of the spatial distribution over time (blue dots). An initial non-linear increase (within the first tens of ps) corresponds to a higher diffusion coefficient reflecting the propagation behavior of transient hot excitons. At later times, we find a linear regime that is used to extract the stationary diffusion coefficient (blue solid lines).
