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Intervalley scattering by atomic defects in monolayer transition metaldichalcogenides (TDMs; MX2) presents a serious obstacle for applicationsexploiting their unique valley-contrasting properties. Here, we show that thesymmetry of the atomic defects can give rise to an unconventional protectionmechanism against intervalley scattering in monolayer TMDs. The predicteddefect-dependent selection rules for intervalley scattering can be verified viaFourier transform scanning tunneling spectroscopy (FT-STS), and provide aunique identification of, e.g., atomic vacancy defects (M vs X). Our findingsput the absence of the intervalley FT-STS peak in recent experiments in adifferent perspective.

Symmetry-forbidden intervalley scattering by atomic defects in monolayer transition-metal dichalcogenides