Fig. 4: Fermi surface- and momentum-dependent CDW gaps of KV₃Sb₅ measured at 5 K.

a–e Symmetrized EDCs along the Fermi surface sheets α (a), β (b, c), γ (d), and δ (e). The corresponding Fermi momentum positions are marked in l by numbers on each Fermi surface sheet. f–j CDW gap size as a function of momentum on the Fermi surface α (f), β (g, h), γ (i) and δ (j). The gap size is obtained by picking the peak positions in the symmetrized EDCs in a–e. When multiple peaks are observed in i and j, the position of the higher binding energy peak is also extracted. Error bars reflect the uncertainty in determining the CDW gaps. k Three-dimensional plot of the Fermi surface-dependent and momentum-dependent CDW gaps in KV₃Sb₅. l High-resolution Fermi surface mapping of KV₃Sb₅ at 5 K. The observed four Fermi surface sheets α, β, γ, and δ are marked.