Abstract
The scaling behaviors of entanglement entropy (EE) against dimension cut-off of density matrix renormalization group (DMRG) in an anisotropic Heisenberg model on honeycomb lattice are investigated. In the gapped dimer phase, the entanglement spectrum (ES) exhibits large gaps and the EE shows an unexpected linear scaling before convergence. In contrast in the gapless Néel phase, the ES decays in a much smoother way, and the EE scales logarithmically. Our calculations show that the linear scaling in the dimer phase originates from one dominant Schmidt number plus n (nearly) degenerate Schmidt numbers that are much smaller than the dominant one. The non-trivial entanglement-scaling properties of the dimer and Néel phases could potentially be used for their detections.
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Peng, C., Ran, SJ., Lewenstein, M. et al. Exotic entanglement scaling of Heisenberg antiferromagnet on honeycomb lattice. Eur. Phys. J. B 91, 258 (2018). https://doi.org/10.1140/epjb/e2018-90197-2
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DOI: https://doi.org/10.1140/epjb/e2018-90197-2