Ground-State Spin of Hubbard Ladder Model with Infinite Electron Repulsion
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We apply perturbation theory and cyclic spin permutation formalism to study the lowest energy states of the infinite-repulsion Hubbard model on n-leg ladders with alternating values of one-site energies i for neighboring rungs. We establish the "ferromagnetic" character of ladder ground-state at electron densities in the interval 1 - (2n)-1 1 and sufficiently large alternation of one-site energies of neighbor rungs of the ladder. We also show the stability of this state against the small deviations of the values of i in contrast to the case of two-leg ladder formed by weakly interacting neighbor rungs with equal one-site energies.