Fig. 3: Acoustic power-dependent IX transport at 100 K.
From: Long-range transport of 2D excitons with acoustic waves
PL images at different SAW power Ps of (a) 0 mW, (b) 4.5 mW, (c) 6 mW. The solid white line outlines the WSe2 flake. The two bright emission spots at the edge of the WSe2 flake highlight the SAW-driven transport of IXs. Scale bar, 10 µm. d The integrated emission intensity at the flake edge (in the area indicated by the yellow box) in a depending on the SAW power Ps. The experimental data is fitted with the theoretical model that the transport exciton density exponentially depends on the square root of Ps. At low Ps, the exciton transport is diffusion-limited (blue shaded). A high Ps, SAW-driven transport is activated (red shaded).
