Fig. 3: Spatiotemporal dynamics of suspended monolayer MoSe2: experiment and theoretical prediction. | Nature Communications

Fig. 3: Spatiotemporal dynamics of suspended monolayer MoSe2: experiment and theoretical prediction.

From: Transient ultrafast and negative diffusion of charge carriers in suspended MoSe2 from multilayer to monolayer

Fig. 3

a Normalized experimental dynamics obtained at different fluences that correspond to photoexcited quasi-free carrier densities in the range 5 − 100 × 1010/cm2 (open circles with dashed lines). b Experimentally obtained spreading for 0.2 and 1 μJ/cm2 excitation fluences (filled circles), compared with the calculated spreading for the two corresponding photoexcited quasi-free carrier densities 5 and 25 × 1010/cm2 (solid lines). The diffusion is clearly nonlinear and contains four different diffusion regimes with very fast (Regime I), fast (Regime II), apparent negative (Regime III), and slow (Regime IV) diffusion. The first two regimes correspond to non-thermalized and quasi-thermalized high-energy quasi-free carriers; Regime III corresponds to exciton formation; and Regime IV corresponds to exciton diffusion.

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