The effect of spin-orbit coupling on nonsymmorphic square-net compounds
The effect of spin-orbit coupling on nonsymmorphic square-net compounds
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DOI：
10.1016/j.jpcs.2017.12.035
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发表时间：
2019-05-01
影响因子：
4
通讯作者：
Schoop, Leslie M.
中科院分区：
文献类型：
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作者：
Topp, Andreas;Vergniory, Maia G.;Schoop, Leslie M.
在狄拉克材料领域，自旋轨道耦合（SOC）通常被认为是破坏性的，因为它可能会提升不受高对称性元素保护的简并。非对称对称性迫使能带结构中的简并点位于不被SOC破坏的高对称点处。然而，简并性通常沿着沿着整个高对称线或面受到保护，从而导致高度各向异性的交叉或节线，这可以大大限制能带线性分散的区域。理论上，SOC可以解决这个问题。在这里，我们通过实验表明，SOC可以解除非对称方网化合物的扩展保护。我们比较ZrSiS和CeSbTe，两种材料具有显着不同的SOC，显示SOC的带结构的影响，通过角分辨光电子能谱和密度泛函理论计算。
In the field of Dirac materials, spin-orbit coupling (SOC) is usually considered disruptive, since it may lift degeneracies that are not protected by high-symmetry elements. Nonsymmorphic symmetries force degenerate points in the band structure at high-symmetry points that are not disrupted by SOC. The degeneracy is, however, often protected along whole high-symmetry lines or faces resulting in highly anisotropic crossings or nodal lines, which can considerably limit the region, in which the bands are linearly dispersed. It has been theoretically suggested that SOC could circumvent this problem. Here, we show experimentally that SOC can lift the extended protection in nonsymmorphic square-net compounds. We compare ZrSiS and CeSbTe, two materials with drastically different SOC, to show the effect of SOC on the band structure by means of angle-resolved photoemission spectroscopy and density functional theory calculations.