Unexpected z-direction ising antiferromagnetic order in a frustrated spin-1/2 J1-J2 XY model on the honeycomb lattice

Zhenyue Zhu, David A. Huse, Steven R. White

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Using the density matrix renormalization group on wide cylinders, we study the phase diagram of the spin-1/2 XY model on the honeycomb lattice, with first-neighbor (J1=1) and frustrating second-neighbor (J 2>0) interactions. For the intermediate frustration regime 0.22 J2 0.36, we find a surprising antiferromagnetic Ising phase, with ordered moments pointing along the z axis, despite the absence of any S zSz interactions in the Hamiltonian. Surrounding this phase as a function of J2 are antiferromagnetic phases with the moments pointing in the x-y plane for small J2 and a close competition between an x-y plane magnetic collinear phase and a dimer phase for large values of J2. We do not find any spin-liquid phases in this model.

Original languageEnglish (US)
Article number257201
JournalPhysical review letters
Volume111
Issue number25
DOIs
StatePublished - Dec 16 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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