By means of the density functional theory in combination with the dynamical mean-field theory, we tried to investigate the electronic structure of hexagonal FeGe, in which the Fe atoms form a quasi-two-dimensional layered kagome lattice. We predict that it is a representative kagome metal characterized by orbital selective Dirac fermions and extremely flat bands. Furthermore, Fe's $3d$ electrons are strongly correlated. They exhibit quite apparent signatures of electronic correlation induced by Hund's rule coupling, such as spin-orbital separation with non-Fermi-liquid behavior and spin freezing at intermediate temperature. Thus, hexagonal FeGe can be regarded as an ideal platform to study the interplay of kagome physics and Hundness.

中文翻译：

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kagome金属中的丰满特征

结合密度泛函理论和动力学平均场理论，我们尝试研究六方FeGe的电子结构，其中Fe原子形成准二维层状kagome晶格。我们预测这是一种代表性的kagome金属，其特征是轨道选择性狄拉克费米子和极平坦的带。此外，铁的$3d$电子是高度相关的。它们表现出由洪德法则耦合引起的非常明显的电子相关性特征，例如具有非费米液体行为的自旋轨道分离和在中间温度下的自旋冻结。因此，六角形的FeGe可以作为研究kagome物理和丰满度相互作用的理想平台。