Hexagonal boron nitride (h-BN) is being widely utilized as a platform for optical and electrical devices exploiting two-dimensional layered materials. By analyzing transmission spectra of h-BN flakes transferred onto quartz plates with the transfer-matrix method, the refractive index of h-BN is determined in the wavelength range from 450 to 1200 nm. The transmission spectra are reproduced by applying the single oscillator model of n(λ) 2 ¼ 1 þ Aλ 2 /(λ 2 Àλ 0 2 ) as the wavelength-dependent refractive index. Averaging over the parameters from different samples, the parameters of λ 0 ¼ 164.4 nm and A ¼ 3.263 are obtained.

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Although single-layer transition-metal dichalcogenides with novel valley functionalities are promising candidate to realize valleytronic devices, the essential understanding of valley depolarization mechanisms is still incomplete. Based on pump-probe experiments performed...