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Diagonal ladders: A class of models for strongly coupled electron systems
We introduce a class of models defined on ladders with a diagonal structure generated by ${n}_{p}$ plaquettes. The case ${n}_{p}=1$ corresponds to the necklace ladder and has remarkable properties that are studied using density matrix renormalization-group and recurrent variational ansatzes. The antiferromagnetic Heisenberg (AFH) model on this ladder is equivalent …