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Sequence<Eigenvectors> -> Scalar
Compute the Berry phase along a closed loop of k-points by taking the phase of the determinant/product of overlaps between consecutive wavefunctions.
Problem it solves
Wavefunctions solved numerically have arbitrary gauge freedom at each k-point, preventing direct integration of the connection.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.