论文标题
Moiré非词对称性和沙漏超导体的工程
Moiré Engineering of Nonsymmorphic Symmetries and Hourglass Superconductors
论文作者
论文摘要
Moiré异质结构有望提供平台，以量身定制物质的强烈关联和拓扑状态。在这里，我们从理论上提出了有效的，矩形的Moiré晶格在带有非词形对称性的SNS的扭曲双层中的出现。基于第一原则的计算，我们证明了强烈的内在旋转轨道相互作用使这个可调的平台成为一个由2D Hourglass Fermions托管的Moirémoirémoiré，由时间反转对称$ \ MATHCAL {t} $保护，而非甲状化螺钉旋转$ \ wideteDe___我们表明，在沙漏色散中连接Weyl节点对的拓扑费米弧被保留用于弱电子电子相互作用，尤其是在超导顺序的区域中，这些区域在相互作用强度和填充的相图中出现。我们的工作确立了Moiré工程，成为了相关拓扑半学的领域，并可能激发了Moiré异质结构的进一步拓扑与拓扑相关的研究。
Moiré heterostructures hold the promise to provide platforms to tailor strongly correlated and topological states of matter. Here, we theoretically propose the emergence of an effective, rectangular moiré lattice in twisted bilayers of SnS with nonsymmorphic symmetry. Based on first-principles calculations, we demonstrate that strong intrinsic spin-orbit interactions render this tunable platform a moiré semimetal that hosts 2D hourglass fermions protected by time-reversal symmetry $\mathcal{T}$ and the nonsymmorphic screw rotation symmetry $\widetilde{\mathcal{C}}_{2y}$. We show that topological Fermi arcs connecting pairs of Weyl nodal points in the hourglass dispersion are preserved for weak electron-electron interactions, particularly in regions of superconducting order that emerge in the phase diagram of interaction strength and filling. Our work established moiré engineering as an inroad into the realm of correlated topological semimetals and may motivate further topology related researches in moiré heterostructures.
