论文标题
二维扣子晶格的实验实现
Experimental Realization of Two-Dimensional Buckled Lieb lattice
论文作者
论文摘要
带有Lieb晶格的二维（2D）材料可以容纳奇特的电子带结构。这种系统在自然界中不存在，由于其结构不稳定，在实验室中也很难获得。在这里，我们通过分子束外延在铝底物上的锡层组成的2D系统实验中实现了一个2D系统。 SN原子在Al（100）表面上受益的特定排列形成了稳定的扣子lieb晶格。我们的理论计算表明，在该Lieb晶格的带结构中，受其镜像反射对称性和拓扑效果（SOC）效应（SOC）效应的部分损坏的节点线环和拓扑上的绝缘状态受到部分断裂。该系统的电子结构还通过扫描隧道光谱和角度分辨光学光谱法进行了实验表征。我们的工作提供了一种基于Lieb晶格构建2D量子材料的吸引人方法。
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.
