二维屈曲Lieb晶格的实验实现
Experimental Realization of Two-Dimensional Buckled Lieb lattice
摘要：
具有Lieb晶格的二维（2D）材料可以具有奇异的电子能带结构。这样的系统在自然界中并不存在，而且由于其结构的不稳定性，在实验室中也很难获得。在这里，我们实验实现了一个2D系统组成的锡覆盖层的铝基板上的分子束外延。Sn原子在Al（100）表面的特殊排列得益于良好的界面相互作用，形成稳定的屈曲Lieb晶格。我们的理论计算表明，一个部分断裂的节线环保护其镜像反射对称性和拓扑非平凡的绝缘态的自旋轨道耦合（SOC）的能带结构的这种Lieb晶格的效果。用扫描隧道谱和角分辨光发射谱对该体系的电子结构进行了实验表征。我们的工作为基于Lieb晶格构建二维量子材料提供了一种有吸引力的方法。
英文摘要：
Two-dimensional (2D) materials with a Lieb lattice can host exotic electronic band structures. Such a system does not exist in nature, and it is also difficult to obtain in the laboratory due to its structural instability. Here, we experimentally realized a 2D system composed of a tin overlayer on an aluminum substrate by molecular beam epitaxy. The specific arrangement of Sn atoms on the Al(100) surface, which benefits from favorable interface interactions, forms a stabilized buckled Lieb lattice. Our theoretical calculations indicate a partially broken nodal line loop protected by its mirror reflection symmetry and a topologically nontrivial insulating state with a spin-orbital coupling (SOC) effect in the band structure of this Lieb lattice. The electronic structure of this system has also been experimentally characterized by scanning tunnelling spectroscopy and angle-resolved photoemmision spectroscopy. Our work provides an appealing method for constructing 2D quantum materials based on the Lieb lattice.
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