arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.08646cond-mat.str-elcond-mat.stat-mechquant-ph
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量子三聚体模型和拓扑SU(3)kagome晶格上的自旋液体

Quantum trimer models and topological SU(3) spin liquids on the kagome lattice

Sven Jandura, Mohsin Iqbal, Norbert Schuch

摘要:

我们在kagome格点上构造并研究了量子三聚体模型和共振SU(3)单态模型,将量子二聚体模型和共振价键波函数推广到三聚体和SU(3)背景下.我们证明了这些模型具有Z_3对称性,它起源于三聚体的结构和SU(3)表示理论,并成为重整化下唯一的对称性。在此基础上,我们构造了具有拓扑9重退化基空间的模型的简单而精确的父哈密顿算子。解析推理和数值分析相结合的结果表明,该模型最终显示的量子有序取决于不同类型三聚体的相对权重,它既可以显示Z_3拓扑有序,也可以形成一个破缺的三聚体晶体,而且还具有一个U(1)对称性增强的点和临界行为。因此,我们的结果适用于SU(3)模型,其中三聚体重量的两个自然选择分别产生拓扑自旋液体或具有连续破序的系统。我们的工作证明了共振三聚体和SU(3)单重态模型在kagome晶格上模拟SU(3)拓扑自旋液体的适用性。

英文摘要:

We construct and study quantum trimer models and resonating SU(3)-singlet models on the kagome lattice, which generalize quantum dimer models and the Resonating Valence Bond wavefunctions to a trimer and SU(3) setting. We demonstrate that these models carry a Z_3 symmetry which originates in the structure of trimers and the SU(3) representation theory, and which becomes the only symmetry under renormalization. Based on this, we construct simple and exact parent Hamiltonians for the model which exhibit a topological 9-fold degenerate ground space. A combination of analytical reasoning and numerical analysis reveals that the quantum order ultimately displayed by the model depends on the relative weight assigned to different types of trimers -- it can display either Z_3 topological order or form a symmetry-broken trimer crystal, and in addition possesses a point with an enhanced U(1) symmetry and critical behavior. Our results accordingly hold for the SU(3) model, where the two natural choices for trimer weights give rise to either a topological spin liquid or a system with symmetry-broken order, respectively. Our work thus demonstrates the suitability of resonating trimer and SU(3)-singlet ansatzes to model SU(3) topological spin liquids on the kagome lattice.

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