论文标题
单层Kagome金属AV $ _3 $ SB $ _5 $
Monolayer Kagome Metals AV$_3$Sb$_5$
论文作者
论文摘要
最近，分层的Kagome金属AV $ _3 $ SB $ _5 $（A = K，RB和CS）已成为探索沮丧的几何形状，相关性和拓扑的肥沃平台。在这里，使用第一原理和平均场计算，我们证明了AV $ _3 $ sb $ _5 $可以以单层形式结晶，从而揭示了使系统独特的一系列属性。最重要的是，二维单层保留了与三维分层体积本质上不同的对称性，并通过化学计量法执行。因此，范霍夫的奇异性，状态电子密度的对数差异被丰富，导致多种竞争不稳定性，例如电荷密度波和S-and D-WAVE超导性。我们表明，通过范霍夫奇点的电子填充单层可以在单层中微调订单之间的竞争。因此，我们的结果表明单层Kagome Metal AV $ _3 $ SB $ _5 $是设计师量子阶段的有前途的平台。
Recently, layered kagome metals AV$_3$Sb$_5$ (A = K, Rb, and Cs) have emerged as a fertile platform for exploring frustrated geometry, correlations, and topology. Here, using first-principles and mean-field calculations, we demonstrate that AV$_3$Sb$_5$ can crystallize in a mono-layered form, revealing a range of properties that render the system unique. Most importantly, the two-dimensional monolayer preserves intrinsically different symmetries from the three-dimensional layered bulk, enforced by stoichiometry. Consequently, the van Hove singularities, logarithmic divergences of electronic density of states, are enriched, leading to a variety of competing instabilities such as doublets of charge density waves and s-and d-wave superconductivity. We show that the competition between orders can be fine-tuned in the monolayer via electron-filling of the van Hove singularities. Thus, our results suggest the monolayer kagome metal AV$_3$Sb$_5$ as a promising platform for designer quantum phases.
