论文标题
CRI $ _3 $ -PB界面中引起的半金属性和无间隙拓扑超导性
Induced Half-Metallicity and Gapless Topological Superconductivity in the CrI$_3$-Pb Interface
论文作者
论文摘要
我们研究了由超导铅（PB）底物上的磁绝缘子铬（CRI $ _3 $）组成的二维异质结构。通过第一原理计算和紧密结合模型，我们证明了从PB底物转移CRI $ _3 $的电荷转移到有效的半米中，从而可以通过接近性效应开始无间隙的无拓扑超导阶段。该阶段仅在费米表面的一部分中存在超导差距，该阶段通常发生在2d半米螺旋形的异质结构中，缺乏平面内旋转对称性。但是，足够大的接近诱导的配对幅度可以将这种系统带入完全传播的拓扑超导阶段。因此，这些结果有望更好地定义未来提议的TSC异质结构的最佳2D组件材料。
We study a two-dimensional heterostructure comprised of a monolayer of the magnetic insulator chromium triiodide (CrI$_3$) on a superconducting lead (Pb) substrate. Through first-principles computation and a tight-binding model, we demonstrate that charge transfer from the Pb substrate dopes the CrI$_3$ into an effective half-metal, allowing for the onset of a gapless topological superconductivity phase via the proximity effect. This phase, in which there exists a superconducting gap only in part of the Fermi surface, is shown to occur generically in 2D half-metal-superconductor heterostructures which lack two-fold in-plane rotational symmetry. However, a sufficiently large proximity-induced pairing amplitude can bring such a system into a fully-gapped topological superconducting phase. As such, these results are expected to better define the optimal 2D component materials for future proposed TSC heterostructures.
