Fig. 5: Variations in the fine structure details in the energy-momentum maps of hBN and WSe2-hBN when comparing the high symmetry directions Γ → M and Γ → K show the anisotropic excitonic response. | npj 2D Materials and Applications

Fig. 5: Variations in the fine structure details in the energy-momentum maps of hBN and WSe2-hBN when comparing the high symmetry directions Γ → M and Γ → K show the anisotropic excitonic response.

From: Mapping the energy-momentum dispersion of hBN excitons and hybrid plasmons in hBN-WSe2 heterostructures

Fig. 5

Energy-momentum dispersion (ωq) maps (log scale) of hBN show the signature of hBN excitons across the whole Brillouin zone (BZ). Fine structure details differ when comparing signatures at a the M point in the Γ → M direction and b the M’ point in the Γ → K direction. The same variations are present in WSe2-hBN when comparing the fine structure at c the M point in the Γ → M direction and d the M’ point in the Γ → K direction. A strong enhancement of the excitonic effects is observed between the K and M’ points in Γ → K direction for hBN and WSe2-hBN.

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