Frustrated Heisenberg antiferromagnet on the honeycomb lattice: A candidate for deconfined quantum criticality

Damian Farnell, R.F. Bishop, P.Y. Li, J Richter, C.E. Campbell

Research output: Contribution to journalArticlepeer-review

Abstract

We study the ground-state (gs) phase diagram of the frustrated spin-1/2 J1–J2–J3 antiferromagnet with J2=J3=?J1 on the honeycomb lattice using coupled-cluster theory and exact diagonalization methods. We present results for the gs energy, magnetic order parameter, spin-spin correlation function, and plaquette valence-bond crystal (PVBC) susceptibility. We find a Néel antiferromagnetic (AFM) phase for ??c2˜0.60, and a paramagnetic PVBC phase for ?c1????c2. The transition at ?c2 appears to be of first-order type, while that at ?c1 is continuous. Since the Néel and PVBC phases break different symmetries our results favor the deconfinement scenario for the transition at ?c1.
Original languageEnglish
Pages (from-to)012403-1 to 0 - 1 to 012403-4
JournalPhysical Review B
Volume84
DOIs
Publication statusPublished - 8 Jul 2011

Keywords

  • frustrated quantum magnetism
  • quantum many-body theory
  • strongly correlated electrons

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