Derives an exact downfolded effective model by integrating out the rest space, states conditions for perturbative truncation, and formally recovers cRPA with corrections.
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SZ-LCT uses a BCH-expanded unitary transformation with a generator chosen to minimize non-seniority-zero Hamiltonian elements, achieving submilliHartree accuracy for strongly correlated electrons at O(N^8/n_c) scaling.
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Exact downfolding and its perturbative approximation
Derives an exact downfolded effective model by integrating out the rest space, states conditions for perturbative truncation, and formally recovers cRPA with corrections.
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Seniority-zero Linear Canonical Transformation Theory
SZ-LCT uses a BCH-expanded unitary transformation with a generator chosen to minimize non-seniority-zero Hamiltonian elements, achieving submilliHartree accuracy for strongly correlated electrons at O(N^8/n_c) scaling.