We argue that several empirical constraints strongly restrict parameters of the effective microscopic spin model describing $\alpha \text{−}{\mathrm{RuCl}}_3$. In particular, such constraints dictate a substantial positive off-diagonal anisotropic coupling ${\mathrm{\Gamma }}^{\prime }>0$, not anticipated previously. The renormalization by quantum fluctuations allows to reconcile larger values of the advocated bare parameters with their earlier assessments and provides a consistent description of the field evolution of spin excitations in the paramagnetic phase. We assert that large anisotropic terms inevitably result in strong anharmonic coupling of magnons, necessarily leading to broad features in their spectra due to decays, in accord with the observations in $\alpha \text{−}{\mathrm{RuCl}}_3$. Using duality transformations, we explain the origin of the pseudo-Goldstone mode that is ubiquitous to the studied parameter space and is present in $\alpha \text{−}{\mathrm{RuCl}}_3$. Our analysis offers a description of $\alpha \text{−}{\mathrm{RuCl}}_3$ as an easy-plane ferromagnet with antiferromagnetic further-neighbor and strong off-diagonal couplings, which is in a fluctuating zigzag ground state proximate to an incommensurate phase that is continuously connected to a ferromagnetic one.

中文翻译：

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重新思考α-RuCl3

我们认为，一些经验约束强烈限制了有效微观自旋模型描述的参数 $\alpha \text{-}{\mathrm{氯化钌}}_3$。特别地，这样的约束决定了基本上正的非对角各向异性耦合${\mathrm{\Gamma }}^{\prime }>0$，以前没有预料到。通过量子涨落进行的归一化可以使所提倡的裸参数的较大值与它们的早期评估相一致，并提供顺磁相中自旋激发场演化的一致描述。我们断言，大的各向异性项不可避免地导致强子的强非谐耦合，这必定会导致其衰变导致谱线中的宽泛特征，这与对于$\alpha \text{-}{\mathrm{氯化钌}}_3$。使用对偶变换，我们解释了伪戈德斯通模式的起源，该模式在研究的参数空间中是普遍存在的，并且存在于$\alpha \text{-}{\mathrm{氯化钌}}_3$。我们的分析提供了对$\alpha \text{-}{\mathrm{氯化钌}}_3$ 它是一种具有反铁磁近邻和强对角线耦合的易平面铁磁体，它处于波动的锯齿状基态，靠近不相称的相位，该相位连续地与铁磁相连接。