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. Author manuscript; available in PMC: 2020 Mar 18.
Published in final edited form as: Rev Mod Phys. 2019;91(1):10.1103/revmodphys.91.015005. doi: 10.1103/revmodphys.91.015005

FIG. 31.

FIG. 31.

Energy spectrum of a SSH chain of M = 10 dimers. A pair of edge states close to zero energy exists when J/J is notably below 1. When J/J increases above 1, these edge states are gradually transformed into bulk states. Adapted from Delplace, Ullmo, and Montambaux, 2011.