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Winding number of SSH model 3
SSH model can be written as
$$H=-\sum_n\big[Jc_n^\dagger d_n + J'd_n^\dagger c_{n+1}\big]+h.c.$$
in Fourier space
$$H(k)=
\begin{bmatrix}
c_k^\dagger && d_{k}^\dagger
\end{bmatrix}
\begin{...
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