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Ground-State Spin of Hubbard Ladder Model with Infinite Electron Repulsion

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Cheranovskii V., Ezerskaya E., Klein D., Tokarev V.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 4
916-918
EN
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 α_{i} for neighboring rungs. We establish the "ferromagnetic" character of ladder ground-state at electron densities in the interval 1 - (2n)¯¹ ≤ ρ ≤ 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 α_{i} in contrast to the case of two-leg ladder formed by weakly interacting neighbor rungs with equal one-site energies.
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