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2017 | 131 | 4 | 916-918
Article title

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

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EN
Abstracts
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.
Keywords
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Contributors
  • V.N. Karazin Kharkiv National University, Svoboda Sq., 4, 61022 Kharkiv, Ukraine
author
  • V.N. Karazin Kharkiv National University, Svoboda Sq., 4, 61022 Kharkiv, Ukraine
author
  • Texas A&M University at Galveston, Galveston, TX, 77554 USA
author
  • V.N. Karazin Kharkiv National University, Svoboda Sq., 4, 61022 Kharkiv, Ukraine
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv131n4099kz
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