The Haldane model with Kekulè distortion possesses various phases characterized by different topology with specific boundary states. Competition between the 1st/2nd order topology (1D/0D boundary states of the 2D bulk) induces a rich phase diagram. The Chern number and the ZQ Berry phases have successfully characterized them and justified the bulk-edge/boundary correspondence. The paper, “Competition of first-order and second-order topology on the honeycomb lattice” by Matthew Bunney, Tomonari Mizoguchi, Yasuhiro Hatsugai, and Stephan Rache, has been accepted for publication in Phys. Rev. B on 20 December 2021 and published online on Published 10 January 2022, Phys. Rev. B 105, 045113 (2022). See also arXiv:2110.15549.
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