Unifying description of competing orders in two-dimensional quantum magnets
Unifying description of competing orders in two-dimensional quantum magnets
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DOI：
10.1038/s41467-019-11727-3
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发表时间：
2018-11
影响因子：
16.6
通讯作者：
Xue Song;Chong Wang;A. Vishwanath;Yin-Chen He
中科院分区：
文献类型：
--
作者：
Xue Song;Chong Wang;A. Vishwanath;Yin-Chen He
量子磁铁提供了最简单的强相互作用量子物质的例子，但它们继续抵制对一个空间维度以上的全面理解。我们探索了一个很有前途的二维框架，Dirac自旋液体(DSL)-量子电动力学(QED3)，其中4个Dirac费米子与光子耦合。重要的是，它的激发包括驱动禁闭的磁单极。我们解决了以前尚未解决的关键问题--正方形、蜂窝状、三角形和Kagome晶格上单极的对称作用。与二分(正方形和蜂窝)晶格相比，三角晶格和Kagome晶格上DSL的稳定性得到了提高。我们得到了三角晶格和Kagome晶格上DSL的普遍签名，包括单极激发的签名，作为对现有材料的数值和实验的指导。即使在不稳定的情况下，DSL也有助于统一和组织相关二维材料中过多的有序相。
Quantum magnets provide the simplest example of strongly interacting quantum matter, yet they continue to resist a comprehensive understanding above one spatial dimension. We explore a promising framework in two dimensions, the Dirac spin liquid (DSL) — quantum electrodynamics (QED3) with 4 Dirac fermions coupled to photons. Importantly, its excitations include magnetic monopoles that drive confinement. We address previously open key questions — the symmetry actions on monopoles on square, honeycomb, triangular and kagome lattices. The stability of the DSL is enhanced on triangular and kagome lattices compared to bipartite (square and honeycomb) lattices. We obtain the universal signatures of the DSL on triangular and kagome lattices, including those of monopole excitations, as a guide to numerics and experiments on existing materials. Even when unstable, the DSL helps unify and organize the plethora of ordered phases in correlated two-dimensional materials.