Fig. 4

Raman results in TBGs using IR, visible and UV radiation and results in gr/h-BN samples. a–d Raman spectra in four TBG samples with θ = 3, 5, 6 and 9°, recorded with the 1.49 or 1.82 excitation energies, as indicated in each figure. e–g UV Raman spectra of three TBG samples θ = 23, 25 and 28°, recorded with the 3.00 or 3.41 excitation energies. h–j Raman spectra in three different samples of graphene on the top of h-BN, with twisting angles θ = 2, 5 and 6°, recorded with the 1.96 eV excitation energy