Figure 3. Topological invariants and bulk-edge correspondence.

(a) Edge states on an open-ended lattice [−L : L], with L=10; the colour coding indicates the degree of localization , with darker colours indicating states more localized towards the edges. (b) Topological invariants C₀ and C_π, obtained as in equation (9) by combining the measurements of the mean chiral displacements and of protocols U and , and averaging the results obtained from the two initial states (error bars are the propagated s.e.). The dashed lines show the long-time limit of the topological indices C₀ and C_π, yielding respectively the number of edge states at 0 and π energy.