Fig. 4: Phase diagram of the half-filled heterobilayer.
From: Moiré potential renormalization and ultra-flat bands induced by quasiparticle-plasmon coupling
Characteristic energies of U and ∆ at half-filling over different twist angles for a ϵ = 7, b ϵ = 10. The purple line is for U, and the red line is for ∆. The background represents the ratio ∆/U. The white dashed line represents the crossing between U and ∆, which is the critical point of the transition between Mott (to the left of the dashed line) and charge-transfer (CT) insulators (to the right of the dashed line). c Phase diagram of Mott and charge-transfer (CT) insulators at half-filling under different twist angles and dielectric constants.
