Fig. 9: Exciton transport assisted by surface acoustic waves.
From: Time-domain study of coupled collective excitations in quantum materials
a Schematic of the experimental setup. Interlayer excitons in bilayer WSe2 are launched on the left via a pump laser and propagate to the right by riding on a surface acoustic wave (SAW) generated by an interdigital transducer (IDT). The excitons are detected by the photoluminescence (PL) signal upon electron-hole recombination. b, c Spectrally resolved photoluminescence image with and without the surface acoustic wave. The length refers to the spatial distance in the exciton propagation direction. h-BN: Hexagonal boron nitride; ITO: Indium-tin-oxide. Adapted from ref. 219, CC BY 4.0.
