k-CIAH enables efficient second-order optimization of Pipek-Mezey Wannier functions with O(N_k² n³) scaling, yielding 2-3x speedup over first-order k-space methods.
(1)] gives Σ kkk = ˜Σ kkk − ˜Σ † kkk, ˜Σ kkkmn = − 2p∑ TTT A Qp− 1 TTT A,000n ∑ kkk′ ( PTTT A,kkkkkk′vkkk′ ) mn (19)
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Fast Generation of Pipek-Mezey Wannier Functions via the Co-Iterative Augmented Hessian Method
k-CIAH enables efficient second-order optimization of Pipek-Mezey Wannier functions with O(N_k² n³) scaling, yielding 2-3x speedup over first-order k-space methods.