Entanglement spectra of Heisenberg ladders of higher spin

  title={Entanglement spectra of Heisenberg ladders of higher spin},
  author={John Schliemann and Andreas M. L{\"a}uchli},
  journal={Journal of Statistical Mechanics: Theory and Experiment},
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 entanglement spectrum is, within first-order perturbation theory, always proportional to the energy spectrum of the single chain with a proportionality factor that is also independent of S. In particular, although the spin ladder possesses an excitation gap over its ground state for any spin length, the entanglement spectrum… 
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