Ground-state phase diagram of the quantum J1-J2 model on the honeycomb lattice

Details Ground-state phase diagram of the quantum J1-J2 model on the honeycomb lattice Ground-state phase diagram of the quantum J1-J2 model on the honeycomb lattice

2011-09-16

arxiv.org/abs/1109.3681v2

Phys. Rev. B 85, 060402 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 table, 5 figures

Scientific paper

10.1103/PhysRevB.85.060402

We study the ground-state phase diagram of the quantum $J_1-J_2$ model on the honeycomb lattice by means of an entangled-plaquette variational ansatz. Values of energy and relevant order parameters are computed in the range $0\le {J_2}/{J_1} \le 1$. The system displays classical order for ${J_2}/{J_1}\lesssim 0.2$ (N\'eel), and for $J_2/J_1 \gtrsim 0.4$ (collinear). In the intermediate region, the ground-state is disordered. Our results show that the reduction of the half-filled Hubbard model to the model studied here does not yield accurate predictions.

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