Gapped spin-liquid phase in the J 1 -J 2 Heisenberg model by a bosonic resonating valence-bond ansatz
Gapped spin-liquid phase in the J 1 -J 2 Heisenberg model by a bosonic resonating valence-bond ansatz
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DOI：
10.1103/physrevb.86.075111
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发表时间：
2012-05
影响因子：
3.7
通讯作者：
Tao E. Li;F. Becca;Wenjun Hu;S. Sorella
中科院分区：
文献类型：
--
作者：
Tao E. Li;F. Becca;Wenjun Hu;S. Sorella
We study the ground-state phase diagram of the spin-1/2 J1-J2 Heisenberg model on the square lattice with an accurate Bosonic resonating valence-bond (RVB) wave function. In contrast to the RVB ansatz based on Schwinger Fermions, the representation based on Schwinger Bosons, supplemented by a variational Monte Carlo technique enforcing the exact projection onto the physical subspace, is able to describe a fully gapped spin liquid in the strongly frustrated regime. In particular, a fully symmetric Z2 spin liquid is stable between two antiferromagnetic phases; a continuous transition at J2=0.4J1, when the Marshall sign rule begins to be essentially violated, and a first-order transition around J2=0.6J1 are present. Most importantly, the triplet gap is found to have a non-monotonic behavior, reaching a maximum around J2=0.51J1, when the lowest spinon excitation moves from the \Gamma to the M point, i.e., k=(\pi,0).
