Optical Visualization of Carrier Surfing in 2D Monolayers Driven by Surface Acoustic Waves

Charge carrier transport is pivotal in advancing nanoelectronics. Despite progress in exciton transport within ultra‐thin semiconductors, the intertwined transport of free carriers and excitons presents challenges. Surface Acoustic Waves (SAWs) offer a compelling solution, enabling remote, real‐time control of excitonic states at room temperature via surfing carriers in 2D materials—a relatively unexplored domain. SAWs create a versatile platform for tailoring excitonic states from microwave to optical frequencies. This study first demonstrates a simple route to visualize directional light transport and carriers drift driven by non‐perfect Rayleigh‐SAWs. Carrier surfing is observed under SAW modulation, with a charge redistribution rate of ≈16.4 µm s −1 , significantly exceeding their natural redistribution in monolayers without SAW, while the drift velocity of free electrons remains on the order of ≈10 3 m s −1 . Enhanced exciton emission is achieved through standing SAWs, generating periodic oscillations. By combining traveling and standing wave portions, controllable on‐demand single‐chip emission is feasible. The findings open avenues for light manipulation, photonic circuits, and on‐chip communications technologies.