Valence-bond crystalline order in the s = 1/2 J1–J2 model on the honeycomb lattice

Valence-bond crystalline order in the s = 1/2 J1–J2 model on the honeycomb lattice
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蜂窝晶格上 s = 1/2 J1–J2 模型中的价键晶序

DOI:
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发表时间:
2013
期刊:
Journal of Physics: Condensed Matter
影响因子:
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通讯作者:
C. Campbell
C. Campbell
中科院分区:
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文献类型:
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作者:
Raymond F. Bishop;P. Li;C. Campbell

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使用耦合簇方法,我们研究了蜂窝晶格上自旋 1/2 海森堡反铁磁体的相图,其中最近邻交换耦合 J1 > 0 和令人沮丧的次近邻耦合 J2 ≡ xJ1 > 0。在 0 < x < 1 范围内,我们发现四个相分别表现出 Néel、6-自旋斑块、交错二聚体和 Néel-II 排序,量子临界点位于 xc1 ≈ 0.207(3)、xc2 ≈ 0.385(10) 和 xc3 ≈ 0.65(5)。 xc1 和 xc3 处的跃迁似乎是连续的(因此是解除限制的),而 xc2 处的跃迁似乎是直接一阶跃迁。
Using the coupled cluster method we study the phase diagram of the spin-1/2 Heisenberg antiferromagnet on a honeycomb lattice with nearest-neighbour exchange coupling J1 > 0 and frustrating next-nearest-neighbour coupling J2 ≡ xJ1 > 0. In the range 0 < x < 1 we find four phases exhibiting respectively Néel, 6-spin plaquette, staggered dimer and Néel-II orderings, with quantum critical points at xc1 ≈ 0.207(3), xc2 ≈ 0.385(10) and xc3 ≈ 0.65(5). The transitions at xc1 and xc3 appear to be continuous (and hence deconfined) ones, while that at xc2 appears to be a direct first-order one.
DOI: 10.1103/physrevb.84.014417
发表时间: 2011-07-25
期刊: PHYSICAL REVIEW B
影响因子: 3.7
作者:
Reuther, Johannes;Abanin, Dmitry A.;Thomale, Ronny
通讯作者: Thomale, Ronny