Acoustic Manipulation of Deterministic Quantum Emitters in WSe.

Surface acoustic waves (SAWs) have recently emerged as a powerful tool for controlling excitonic states in two-dimensional (2D) transition metal dichalcogenides, enabling dynamic energy modulation and transport of carriers over micron-scale distances. Yet, the use of SAWs to realize direct, high-speed manipulation of site-controlled quantum emitters (QEs) in 2D materials remains largely unexplored. Here, we show acoustic manipulation of deterministic, strain-induced QEs in monolayer WSe by interfacing them with SAWs on a lithium niobate substrate. Using gold nanocube stressors to precisely engineer local strain, we overcome the stochastic nature of defect-based QEs. Upon SAW excitation, these deterministic QEs exhibit an energy shift of up to 0.58 meV at tuning bandwidth up to 8 MHz, enabling half-GHz optical modulation speed despite residing 210 nm above the SAW-carrying substrate. Power-dependent experiments reveal a nonlinear response regime of the SAW-driven nanocube stressor for RF excitation near the energetically lowest-lying flexural mode, highlighting the acousto-optical transduction in our device. Our findings provide a robust, scalable approach for fast, dynamic tuning of single photons with strongly suppressed spectral diffusion and may offer opportunities for nanoscale quantum sensors capable of mapping out acoustic fields with subwavelength spatial resolution on a chip.