论文标题
拓扑电子结构演变，对称破坏旋转重新定位（fe $ _ {1-x} $ co $ _ {x} $）sn
Topological Electronic Structure Evolution with Symmetry Breaking Spin Reorientation in (Fe$_{1-x}$Co$_{x}$)Sn
论文作者
论文摘要
由于拓扑，磁性和电子相关性之间的相互作用，托管Kagome Lattices的拓扑材料引起了人们的关注。 （fe $ _ {1-x} $ co $ _x $）SN系统不仅托管kagome晶格，而且具有可调的对称性破坏磁矩，温度和掺杂。在这项研究中，使用角度分辨的光发射光谱和第一原理计算用于研究拓扑电子结构与从平面到轴向抗抗铁磁相的不同磁矩之间的相互作用。在低温轴向相中揭示了理论上预测的差距，但在温度依赖性磁相变变中未观察到差距。然而，观察到拓扑表面带在实验测量过程中随着时间的流逝而随着时间的流逝而变化，能量会移动能量。转移的表面带可能排除了依赖温度的大容量间隙的确定，但突出了磁性和拓扑之间的复杂联系，而表面/散装二分法可以影响材料特性及其询问。
Topological materials hosting kagome lattices have drawn considerable attention due to the interplay between topology, magnetism, and electronic correlations. The (Fe$_{1-x}$Co$_x$)Sn system not only hosts a kagome lattice but has a tunable symmetry breaking magnetic moment with temperature and doping. In this study, angle resolved photoemission spectroscopy and first principles calculations are used to investigate the interplay between the topological electronic structure and varying magnetic moment from the planar to axial antiferromagnetic phases. A theoretically predicted gap at the Dirac point is revealed in the low temperature axial phase but no gap opening is observed across a temperature dependent magnetic phase transition. However, topological surface bands are observed to shift in energy as the surface magnetic moment is reduced or becomes disordered over time during experimental measurements. The shifting surface bands may preclude the determination of a temperature dependent bulk gap but highlights the intricate connections between magnetism and topology with a surface/bulk dichotomy that can affect material properties and their interrogation.
