Hexagonal CoSn is a newly-discovered frustrated kagome metal. It shows close-to-textbook flat bands and orbital-selective Dirac fermions, which are largely associated with its strongly correlated Co-3$d$ orbitals. Because correlated electronic states are easily regulated by external conditions (such as chemical doping, pressure, and temperature), the fate of these kagome-derived electronic bands upon temperature becomes an interesting and unsolved question. In this work, we try to study the temperature-dependent electronic structures of hexagonal CoSn by means of the density functional theory in conjunction with the embedded dynamical mean-field theory. We find that hexagonal CoSn is in close proximity to a Mott insulating state at ambient condition. Special attention is devoted to the evolution of its Co-3$d$ electronic states with respect to temperature. At least six different temperatures (or energy scales), namely $T^{*}$, $T_{\text{FL}}$, $T_{\text{S1}}$ (and $T_{\text{S2}}$), $T_{\text{SF}}$, and $\bar{T}$, are figured out. They are related to stabilization of the "pseudogap" state, emergence of the non-Fermi-liquid phase, onset (and completeness) of the intermediate spin state, occurrence of the spin-frozen phase, beginning of the orbital freezing transition, respectively.
How correlations change the magnetic structure factor of the kagome Hubbard model
戈薇哈伯德模型（KHM）是受抑二维模型的一个典型例子。虽然它的强相关制度，海森堡模型描述，是热门的兴趣，由于其神秘的前景自旋液体基态，弱和适度的相关制度仍然在很大程度上未被探索。由于金属可果美材料（例如，Mn $_3$ Sn，Fe $_3$ Sn $_2$，FeSn，Co $_3$ Sn $_2$ S $_2$，Gd $_3$ Ru $_4$ Al $_{12}$），我们通过三种互补的数值方法：动力学平均场论（DMFT），动力学顶点近似（D $Γ$ A）和行列式量子蒙特卡罗（DQMC）研究了KHM的各个区域.与原型正方形晶格相反，我们没有发现磁有序的趋势，因为磁相关性仍然是短程的。然而，磁相关性经历了一个显着的交叉作为系统接近金属到绝缘体的转变。然而，莫特跃迁本身并不影响磁关联。我们的等时和动力学结构因子可以作为一个参考的非弹性中子散射实验上的不断增长的家庭的金属kagome材料。
FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
