Fig. 4: Emergence of a ν = 1/3 fractional Chern insulating state.
From: Topological flat bands in a kagome lattice multiorbital system
Low-energy spectra of an interacting model with tδ = 0.5 with r2 = 0 (a) and r2 = −0.2 b Other parameter values are λ = 0.2, U = 2 (local Coulomb interaction), and V = 1 (nearest-neighbor Coulomb interaction). Ground state energy is indicated by black squares, and excited state energies are indicated by different symbols. c Spectral flow of the ground state manifold upon flux insertion with tδ = 0.5 with r2 = −0.2. Red solid lines, green dashed lines, and blue dash-dotted lines are for sector (k1, k2) = (0, 0), (0, 2), and (0, 4), respectively.
