论文标题
电子相关对2D范德华材料中交换相互作用和自旋激发的影响
Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials
论文作者
论文摘要
尽管付出了很大的努力，但磁相互作用的性质以及电子相关效应在磁性二维（2D）范德华材料中的作用仍然难以捉摸。使用CRI $ _3 $作为模型系统，我们表明包括非局部电子相关性的计算出的电子结构可产生与无弹性中子中子散射测量相一致的旋转激发。值得注意的是，这种方法标识了未报告的相关增强的层间超苏式交换，它旋转了磁蛋白狄拉克线，并引入了差距，高对称性$γ$ - $ k $ -k $ - $ m $ m $路径。这一发现提供了在CRI $ _3 $中观察到的间隙打开机制的不同观点，该机制以前与Dzyaloshinskii-Moriya的相互作用或Kitaev相互作用相关。我们的观察结果阐明了电子相关性在磁性范德华材料中旋转顺序和自旋动力学上的关键作用，并证明了在宽2D磁性材料的广泛家族中明确处理电子相关性的必要性。
Despite serious effort, the nature of the magnetic interactions and the role of electron-correlation effects in magnetic two-dimensional (2D) van der Waals materials remain elusive. Using CrI$_3$ as a model system, we show that the calculated electronic structure including nonlocal electron correlations yields spin excitations consistent with inelastic neutron scattering measurements. Remarkably, this approach identifies an unreported correlation-enhanced interlayer super-superexchange, which rotates the magnon Dirac lines off, and introduces a gap along, the high-symmetry $Γ$-$K$-$M$ path. This discovery provides a different perspective on the gap opening mechanism observed in CrI$_3$, which was previously associated with spin-orbit coupling through the Dzyaloshinskii-Moriya interaction or Kitaev interaction. Our observation elucidates the critical role of electron correlations on the spin ordering and spin dynamics in magnetic van der Waals materials and demonstrates the necessity of explicit treatment of electron correlations in the broad family of 2D magnetic materials.
