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

Abstract

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 $J_2/J_1\lesssim 0.2$ (Néel), 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.

5 pages, 1 table, 5 figures

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