论文标题
分数化平均场理论的动力学：Kitaev材料的后果
Dynamics of fractionalized mean-field theories: consequences for Kitaev materials
论文作者
论文摘要
在实验和理论上，最近的努力是为了找到Kitaev Spin-liquid的物质实现，这是蜂窝晶格上确切解决的Kitaev模型的基础状态。现在，候选材料很丰富，但是非基塔夫术语的存在使理论和实验挑战之间进行了比较。我们重新依赖时间依赖的主要均值场理论，并将其扩展到包括量子相信息，从而可以直接计算实验相关的动态自旋旋转相关器，从而重现了未扰动模型的精确结果。与以前的工作相反，我们发现小扰动并没有实质性改变确切的结果，这意味着$α$ -rucl $ {} _ 3 $也许与Kitaev阶段相比要比最初想象的要远。我们的方法概括了任何相关器，以及Majorana平均场理论是有效起点的任何模型。
There have been substantial recent efforts, both experimentally and theoretically, to find a material realization of the Kitaev spin-liquid--the ground state of the exactly solvable Kitaev model on the honeycomb lattice. Candidate materials are now plentiful, but the presence of non-Kitaev terms makes comparison between theory and experiment challenging. We rederive time-dependent Majorana mean-field theory and extend it to include quantum phase information, allowing the direct computation of the experimentally relevant dynamical spin-spin correlator, which reproduces exact results for the unperturbed model. In contrast to previous work, we find that small perturbations do not substantially alter the exact result, implying that $α$-RuCl${}_3$ is perhaps farther from the Kitaev phase than originally thought. Our approach generalizes to any correlator and to any model where Majorana mean-field theory is a valid starting point.
