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Coherence is a crucial requirement to realize quantum manipulation throughlight-matter interactions. Here we report the observation of anomalously robustvalley polarization and valley coherence in bilayer WS2. The polarization ofthe photoluminescence from bilayer WS2 inherits that of the excitation sourcewith both circularly and linearly polarized and retains even at roomtemperature. The near unity circular polarization of the luminescence revealsthe coupling of spin, layer and valley degree of freedom in bilayer system,while the linear polarized photoluminescence manifests quantum coherencebetween the two inequivalent band extrema in momentum space, namely, the valleyquantum coherence in atomically thin bilayer WS2. This observation opens newperspectives for quantum manipulation in atomically thin semiconductors.

Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2