Extended Data Fig. 4: Removing lattice sites.
From: Trapped fractional charges at bulk defects in topological insulators
a, d, Lattice configuration of the HOTI used in simulations. We consider a lattice with 10 × 10 unit cells, intracell coupling strength of 0.25 (dashed lines) and intercell coupling strength of 1 (solid lines). The resonator being removed is denoted by a red circle. b, e, The spectrum of the lattice in a and d as a function of the on-site potential applied to the highlighted resonators. c, f, The fractional part of the mode density integrated over the shaded sector in a and d for each band.
