Low-order hybridization expansions fail in multi-orbital systems because the least correlated orbital suppresses correlation features across all orbitals through spurious couplings generated by the truncation.
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QAssemble is a new pure-Python package for quantum many-body calculations that achieves up to 60x speedup via vectorization and discrete Lehmann representation while validating on graphene.
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Validity and Limits of Low Order Hybridization Expansion Approaches for Multi-Orbital Systems
Low-order hybridization expansions fail in multi-orbital systems because the least correlated orbital suppresses correlation features across all orbitals through spurious couplings generated by the truncation.
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QAssemble: A Pure Python Package for Quantum Many-Body Theory
QAssemble is a new pure-Python package for quantum many-body calculations that achieves up to 60x speedup via vectorization and discrete Lehmann representation while validating on graphene.