Fig. 3: Control of the band flatness.
From: Topological flat bands in a kagome lattice multiorbital system
a Color map of the flatness Δε of the highest band as a function of tδ and the ratio between the nearest-neighbor and the second-neighbor hopping r2 with λ = 0.2. Open square (filled circle) locates tδ = 0.5 with r2 = 0 (−0.2). Red closed loops show the areas where the band gap is positive Δgap > 0. b Bulk band structure with tδ = 0.5, r2 = −0.2, and λ = 0.2. Band-dependent Chern number is also shown.
