期刊
PHYSICAL REVIEW B
卷 86, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.045115
关键词
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资金
- EU
We study the ground-state phase diagram of the quantum J(1)-J(2) model on a square lattice by means of an entangled-plaquette variational Ansatz. In the range 0 <= J(2)/J(1) <= 1, we find classical magnetic order of Neel and collinear type, for J(2)/J(1) less than or similar to 0.5 and J(2)/J(1) greater than or similar to 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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