In the Creutz ladder, eta-pairing states remain identifiable with logarithmic entanglement entropy even at band touching, but interband coupling breaks the exact tower structure and renormalizes the pairing energy.
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Eta-pairing state in flatband lattice: Interband coupling effect on entanglement entropy logarithm
In the Creutz ladder, eta-pairing states remain identifiable with logarithmic entanglement entropy even at band touching, but interband coupling breaks the exact tower structure and renormalizes the pairing energy.