The Chern number of a two-band model equals the difference of its 1D winding numbers at two chiral-symmetric momenta, and boundary-adapted unit cells make the 1D bulk-edge correspondence work in finite extended SSH chains.
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Connection between the winding number and the Chern number
The Chern number of a two-band model equals the difference of its 1D winding numbers at two chiral-symmetric momenta, and boundary-adapted unit cells make the 1D bulk-edge correspondence work in finite extended SSH chains.