论文标题
三维自旋模型中的木剂分散和动态旋转响应，$α$ -rucl $ _3 $
Magnon dispersion and dynamic spin response in three-dimensional spin models for $α$-RuCl$_3$
论文作者
论文摘要
在搜索键对键 - 肛门相互作用和由此产生的旋转液体相的实验实现时，分层的磁铁$α$ -rucl $ _3 $是主要候选者。它的建模通常涉及海森堡，基塔夫和对称的非对角线$γ$相互作用，二维蜂窝晶状体上的相互作用。但是，最近的中子散射实验指向相当的磁性互层耦合。在这里，我们研究了$α$ -rucl $ _3 $的三维交换模型，对于可能的$ r \ bar {3} $和$ c2/m $ $ crystal结构。我们讨论了层间耦合，构建最小模型的对称约束，并使用它们来计算磁模式分散和动态旋转结构因子，在零视场的锯齿形相和顺磁性高场相中。我们对层中模式分散体的预测应指导未来的实验；他们还要求重新评估与$α$ -rucl $ _3 $相关的定量模型参数。
In the search for experimental realizations of bond-anisotropic Kitaev interactions and resulting spin-liquid phases, the layered magnet $α$-RuCl$_3$ is a prime candidate. Its modelling typically involves Heisenberg, Kitaev, and symmetric off-diagonal $Γ$ interactions on the two-dimensional honeycomb lattice. However, recent neutron-scattering experiments point towards a sizeable magnetic interlayer coupling. Here we study three-dimensional exchange models for $α$-RuCl$_3$, for both possible $R\bar{3}$ and $C2/m$ crystal structures. We discuss the symmetry constraints on the interlayer couplings, construct minimal models, and use them to compute the magnetic mode dispersion and the dynamical spin structure factor, in both the zero-field zigzag phase and the paramagnetic high-field phase. Our predictions for the interlayer mode dispersion shall guide future experiments; they also call for a reevaluation of the quantitative model parameters relevant for $α$-RuCl$_3$.
