Ground-state phase diagram of the quantum $J_1-J_2$ model on the square lattice

Details Ground-state phase diagram of the quantum $J_1-J_2$ model on the square lattice Ground-state phase diagram of the quantum $J_1-J_2$ model on the square lattice

2012-03-28

arxiv.org/abs/1203.6381v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

We study the ground-state phase diagram of the quantum $J_1-J_2$ model on the square lattice by means of an entangled-plaquette variational ansatz. In the range $0\le {J_2}/{J_1} \le 1$, we find classical magnetic order of N\'eel and collinear type, for ${J_2}/{J_1}\lesssim 0.5$, and $J_2/J_1 \gtrsim 0.6$ respectively. For intermediate values of $J_2/J_1$ the ground state is a spin liquid (i.e., paramagnetic with no valence bond crystalline order). Our estimates of the entanglement entropy show that such a spin liquid is topological.

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