论文标题
单层PB（clo $ _ {2} $）$ _ {2} $ and Sr（clo $ _ {2} $）$ _ {2} $
Two-dimensional hourglass Weyl nodal loop in monolayer Pb(ClO$_{2}$)$_{2}$ and Sr(ClO$_{2}$)$_{2}$
论文作者
论文摘要
最近，固态材料中的沙漏费物吸引了重大兴趣。但是，具有沙漏形带结构的现实二维（2D）材料仍然非常稀缺。在这里，通过第一原则计算，我们将单层PB（clo $ _ {2} $）$ _ {2} $ _ {2} $ and Sr（clo $ _ {2} $）$ _ {2} $）$ _ {2} $材料作为新的逼真的材料平台，以实现2D小时Weyl Nodal Loop。我们表明，在没有旋转轨道耦合（SOC）的情况下，这些单层材料具有围绕$γ$点（BZ）边界的$γ$点和Weyl节点线的沙漏Weyl节点环。通过对称分析，我们证明了沙漏的Weyl淋巴结环和Weyl节点线受到非词形对称性的保护，并且在双轴菌株下是可靠的。当我们包括SOC时，将在沙漏节点环和节点线中打开一个微小的差距，并且可以将节点线转换为旋转的轨道点。我们的结果提供了一个新的逼真的材料平台，用于研究与2D沙漏Weyl节点环和旋转轨道越野点相关的有趣物理。
The hourglass fermions in solid-state materials have been attracting significant interest recently. However, realistic two-dimensional (2D) materials with hourglass-shaped band structures are still very scarce. Here, through the first-principles calculations, we identify the monolayer Pb(ClO$_{2}$)$_{2}$ and Sr(ClO$_{2}$)$_{2}$ materials as the new realistic materials platform to realize 2D hourglass Weyl nodal loop. We show that these monolayer materials possess an hourglass Weyl nodal loop circling around the $Γ$ point and Weyl nodal line on the Brillouin zone (BZ) boundary in the absence of spin-orbit coupling (SOC). Through the symmetry analysis, we demonstrate that the hourglass Weyl nodal loop and Weyl nodal line are protected by the nonsymmorphic symmetries, and are robust under the biaxial strains. When we include the SOC, a tiny gap will be opened in the hourglass nodal loop and nodal line, and the nodal line can be transformed into the spin-orbit Dirac points. Our results provide a new realistic material platform for studying the intriguing physics associated with the 2D hourglass Weyl nodal loop and spin-orbit Dirac points.
