A matrix-logarithm self-consistent interpolation for the Berry connection improves accuracy over prior schemes by respecting the full overlap matrix structure and relating basis incompleteness to the invariant spread functional.
Kohn, Physical Review115, 809 (1959)
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Self-consistent evaluation of the Berry connection for Wannier functions
A matrix-logarithm self-consistent interpolation for the Berry connection improves accuracy over prior schemes by respecting the full overlap matrix structure and relating basis incompleteness to the invariant spread functional.