Linearly Polarized Luminescence of Atomically Thin MoS Semiconductor Nanocrystals.

Atomically thin layers of transition-metal dichalcogenides semiconductors, such as MoS, exhibit strong and circularly polarized light emission due to inherent crystal symmetries, pronounced spin-orbit coupling, and out-of-plane dielectric and spatial confinement. While the layer-by-layer confinement is well-understood, the understanding of the impact of in-plane quantization in their optical spectrum is far behind. Here, we report the optical properties of atomically thin MoS colloidal semiconductor nanocrystals.