The frustrated Heisenberg antiferromagnet on the honeycomb lattice: J 1-J 2 model

R. F. Bishop, P. H.Y. Li, D. J.J. Farnell, C. E. Campbell

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We study the ground-state phase diagram of the frustrated spin-1/2J 1-J 2 antiferromagnet with J 2 = xJ 1 > 0 (J 1 > 0) on the honeycomb lattice, using the coupled-cluster method. We present results for the ground-state energy, magnetic order parameter and plaquette valence-bond crystal (PVBC) susceptibility. We find a paramagnetic PVBC phase for x c1 < x < x c2, where x c1 ≈ 0.207 ± 0.003 and x c2 ≈ 0.385 ± 0.010. The transition at x c1 to the Néel phase seems to be a continuous deconfined transition (although we cannot exclude a very narrow intermediate phase in the range 0.21 ≲ x ≲ 0.24), while that at x c2 is of first-order type to another quasiclassical antiferromagnetic phase that occurs in the classical version of the model only at the isolated and highly degenerate critical point x = 1/2 . The spiral phases that are present classically for all values x > 1/6 are absent for all x ≲ 1.

Original languageEnglish (US)
Article number236002
JournalJournal of Physics Condensed Matter
Issue number23
StatePublished - Jun 13 2012


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