The Fermion-ladder Models: Extensions of the Hubbard Model with η-pairing
Heng Fan
Abstract
We propose the two-leg fermion-ladder models for SU(2|2) and SU(4) cases. The former is exactly the extended Hubbard model proposed by Essler, Korepin and Schoutens. The later is a new model also with η-pairing symmetry which is important for superconductivity. This new extension of the Hubbard model can be solved exactly.
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