Fig. 7. Summarized phase diagram of surface K–dosed (Li_0.8Fe_0.2OH)FeSe.

The insets in regimes I and II sketch the Fermi surface before and after the Lifshitz transition. The red, blue, and green dots represent the value of Δ₁, Δ₂, and Δ₃, respectively. Gray circles represent the ARPES measured gap size on the δ band (gray dashed line traces its variation). ARPES measurement suggests that Δ₁ and Δ₂ would not suddenly disappear when entering regime II, as illustrated by the short black dashed lines. SC, superconducting.