Excitons in atomically thin semiconductors are sensitive to their electronic and photonic environments.
Therefore, they exhibit rich exciton dynamics. They are confined in the vertical direction while extending
and diffusing along the atomically thin plane. Excitons can also interact with each other, notably to reduce
light emission at high densities through exciton-exciton annihilation. Furthermore, their fluorescence is
affected by their nanoscopic environment. Here we present our experimental and theoretical results on
the fluctuation, diffusion, and annihilation of excitons near nanostructures. Our results have implications
for exciton-based sensors, single-photon sources based on 2D materials, and efficient and high-power
light-emitting devices.
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