论文标题
识别2D过渡金属二盐元中拓扑超导性
Identifying Topological Superconductivity in 2D Transition-Metal Dichalcogenides
论文作者
论文摘要
我们研究了原型的二维（2D）过渡金属二色元（TMDCS）WS $ _2 $，MOTE $ _2 $，MOS $ _2 $，以及在2H阶段允许我们的第一个$ green $ green $ green $ progens progent $ _2 $。具有强旋轨耦合的轨道的$ p $歧管，产生了与物质特定细节的配对预测。由此产生的差距功能表现出各种混合式超导状态，包括$ s $，$ p $，$ d $，$ f $，$ d \ pm ID $和$ p \ pm pp pm $配对模式。特别是，我们预测3％和4％的孔洞WS $ _2 $是手性$ p \ pm pp $ pm $拓扑超导体。对于1％孔培养的MOS $ _2 $，我们发现了三种双重变性手性和非手续不稳定性之间的竞争。总体而言，由于费米表面片之间的嵌套，发现相对配对强度遵循费米表面拓扑。最后，我们讨论了与可用的实验数据有关的预测，并对预测的超导配对对称性进行了分类。
We study the superconducting pairing instabilities and gap functions for prototypical two-dimensional (2D) transition-metal dichalcogenides (TMDCs) WS$_2$, MoTe$_2$, and MoS$_2$ in the 2H phase under both hole and electron doping at 10 K. Our first-principles quantum many-body Green's function approach allows us to treat the full $d$ and $p$ manifold of orbitals with strong spin-orbit coupling, yielding pairing predictions with material specific detail. The resulting gap functions exhibit a variety of mixed-parity superconducting states, including $s$, $p$, $d$, $f$, $d\pm id$, and $p\pm ip$ pairing modes. In particular, we predict 3% and 4% hole-doped WS$_2$ to be a chiral $p\pm ip$ topological superconductor. For 1% hole-doped MoS$_2$, we find a competition between three doubly degenerate chiral and non-chiral instabilities. Overall, the relative pairing strengths are found to follow the Fermi surface topology, due to nesting between the Fermi surface sheets. Finally, we discuss our predictions in relation to available experimental data and classify the topology of the predicted superconducting pairing symmetries.
