Magnetic order and paramagnetic phases in the quantum J1-J2-J3 honeycomb model
Magnetic order and paramagnetic phases in the quantum J1-J2-J3 honeycomb model
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DOI：
10.1103/physrevb.84.014417
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发表时间：
2011-07-25
影响因子：
3.7
通讯作者：
Thomale, Ronny
中科院分区：
文献类型：
--
作者：
Reuther, Johannes;Abanin, Dmitry A.;Thomale, Ronny
最近的研究表明，量子自旋液体可以出现在蜂窝晶格上的现实费米子模型中。我们研究了量子自旋1/2海森堡蜂窝模型，考虑耦合J(1)， J(2)和J(3)到第三近邻。我们使用无偏伪费米子泛函重整群方法来计算磁化率并确定模型的有序和无序状态。除了反铁磁-，共线-和螺旋阶域外，我们发现在中间J(2)耦合处有一个大的顺磁区。对于该区域较大的J(2)，我们发现二聚体有很强的交错排序趋势，而对于低J(2)的剩余顺磁区，仅显示出弱的斑块和交错二聚体响应。我们认为，当电荷波动包括在内时，这个区域是寻找量子自旋液态的一个有希望的区域。
Recent work shows that a quantum spin liquid can arise in realistic fermionic models on a honeycomb lattice. We study the quantum spin-1/2 Heisenberg honeycomb model, considering couplings J(1), J(2), and J(3) up to third nearest neighbors. We use an unbiased pseudofermion functional renormalization-group method to compute the magnetic susceptibility and to determine the ordered and disordered states of the model. Aside from antiferromagnetic-, collinear-, and spiral-order domains, we find a large paramagnetic region at intermediate J(2) coupling. For larger J(2) within this domain, we find a strong tendency for staggered dimer ordering, while the remaining paramagnetic regime for low J(2) shows only weak plaquette and staggered dimer responses. We suggest this regime to be a promising region for looking for quantum spin-liquid states when charge fluctuations would be included.