For Hubbard models with bond-charge interactions on general graphs, a loop phase condition makes eta-pairing states exact eigenstates, and extra eigenstates exist for the associated Hubbard-type model.
Lieta, arXiv: 2502.04559 (2025)
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Eta-pairing states in Hubbard models with bond-charge interactions on general graphs
For Hubbard models with bond-charge interactions on general graphs, a loop phase condition makes eta-pairing states exact eigenstates, and extra eigenstates exist for the associated Hubbard-type model.