论文标题
易感性各向异性及其在基塔夫材料模型中的障碍演变
Susceptibility anisotropy and its disorder evolution in models for Kitaev materials
论文作者
论文摘要
具有强旋轨耦合的Mott绝缘子对应用磁场表现出强烈的各向异性响应。这特别适用于Kitaev材料，其中$α$ -rucl $ _3 $和Na $ _2 $ iro $ _3 $代表两个重要示例。两者都在低温下显示出磁有序的锯齿形状态，并且已经大量努力用于正确对这些系统进行建模，以确定实现量子旋转液体的路线。在这里，我们研究了主要在温度升高时的相关海森贝格 - 基塔维 - $γ$模型，重点是平面内和面外均匀敏感性之间的特征性各向异性。对于$α$ -rucl $ _3 $，我们发现可以通过将大型非对角线$γ_1$与中等$ g $ g $ factor的各向异性相结合来复制实验观察到的各向异性，包括其温度依赖性。此外，我们详细研究了磁稀释的效果，并为温度依赖性敏感性的兴奋剂演变提供了预测。
Mott insulators with strong spin-orbit coupling display a strongly anisotropic response to applied magnetic fields. This applies in particular to Kitaev materials, with $α$-RuCl$_3$ and Na$_2$IrO$_3$ representing two important examples. Both show a magnetically ordered zigzag state at low temperatures, and considerable effort has been devoted to properly modeling these systems in order to identify routes towards realizing a quantum spin liquid. Here, we investigate the relevant Heisenberg-Kitaev-$Γ$ model primarily at elevated temperatures, focusing on the characteristic anisotropy between the in-plane and out-of-plane uniform susceptibility. For $α$-RuCl$_3$, we find that the experimentally observed anisotropy, including its temperature dependence, can be reproduced by combining a large off-diagonal $Γ_1$ coupling with a moderate $g$-factor anisotropy. Moreover, we study in detail the effect of magnetic dilution and provide predictions for the doping evolution of the temperature-dependent susceptibilities.
