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 language | English (US) |
|---|---|
| Article number | 257201 |
| Journal | Physical review letters |
| Volume | 111 |
| Issue number | 25 |
| DOIs | |
| State | Published - Dec 16 2013 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Zhu, Z., Huse, D. A., & White, S. R. (2013). Unexpected z-direction ising antiferromagnetic order in a frustrated spin-1/2 J1-J2 XY model on the honeycomb lattice. Physical review letters, 111(25), [257201]. https://doi.org/10.1103/PhysRevLett.111.257201