论文标题
Honeycomb Ferromagnet Crbr $ _3 $中狄拉克木元素的热演化
Thermal Evolution of Dirac Magnons in the Honeycomb Ferromagnet CrBr$_3$
论文作者
论文摘要
Crbr $ _3 $是二维蜂窝Ferromagnet的绝佳实现，它提供了具有乳清烯和狄克镁和拓扑特征的玻色子石墨烯。我们使用最先进的仪器进行了非弹性中子散射（INS）测量，以更新50年历史的数据，从而与最近在DIRAC点的显着差距以及对热镁重量化的理论预测的最新实验性主张进行了明确的比较。我们证明Crbr $ _3 $具有下一个邻居$ J_2 $和$ J_3 $互动，约为$ J_1 $的5 \％，这是K点的理想Dirac Magnon分散剂，以及Isospin Winding的相关签名。镁寿命和热带重归其化表明，通过相互作用的自旋波处理预期的通用$ t^2 $进化，但是测得的分散体缺乏预测的范霍夫特征，突显了对更深入的理论分析的需求。
CrBr$_3$ is an excellent realization of the two-dimensional honeycomb ferromagnet, which offers a bosonic equivalent of graphene with Dirac magnons and topological character. We perform inelastic neutron scattering (INS) measurements using state-of-the-art instrumentation to update 50-year-old data, thereby enabling a definitive comparison both with recent experimental claims of a significant gap at the Dirac point and with theoretical predictions for thermal magnon renormalization. We demonstrate that CrBr$_3$ has next-neighbor $J_2$ and $J_3$ interactions approximately 5\% of $J_1$, an ideal Dirac magnon dispersion at the K point, and the associated signature of isospin winding. The magnon lifetime and the thermal band renormalization show the universal $T^2$ evolution expected from an interacting spin-wave treatment, but the measured dispersion lacks the predicted van Hove features, highlighting the need for a deeper theoretical analysis.
