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Entanglement Spectra of Heisenberg Ladders of higher Spin

We study the entanglement spectrum of Heisenberg spin ladders of arbitrary spin length S in the perturbative regime of strong rung coupling. For isotropic spin coupling the the entanglement spectrum is, within first order perturbation theory, always proportional to the energy spectrum of the single chain with a proportionality factor being also independent of S. A more complicated situation arises for anisotropic ladders of higher spin S>=1 since here even the unperturbed ground state has a nontrivial entanglement spectrum. Finally we discuss related issues in dimerized spin chains.

preprint2012arXivOpen access
John SchliemannAndreas M. Läuchli
cond-mat.stat-mechquant-ph
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John SchliemannAndreas M. Läuchli

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