双层过渡金属二硫族化合物中的多奇宇称超导相
Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides
摘要：
研究了二维局部非中心对称三角晶格中的非常规超导性。例如，该模型与具有2 H $_b$堆叠结构的双层过渡金属二硫属化物相关。在无规相位近似下，通过求解线性化的Eliashberg方程分析了超导不稳定性.我们发现，铁磁涨落是占主导地位的，由于存在断开费米口袋附近的范霍夫奇点，因此奇宇称自旋三重态超导性是有利的。在没有自旋轨道耦合的情况下，我们发现奇宇称$f$波超导态在很宽的载流子密度和层间耦合范围内是稳定的。此外，我们还研究了层相关的交错Rashba和Zeeman自旋轨道耦合对超导电性的影响。得到了自旋-轨道耦合和库仑相互作用对多重奇宇称超导相图的影响。特别是，拓扑手性$p$波配对状态是稳定的存在下，一个温和的塞曼自旋轨道耦合。我们的结果揭示了奇宇称超导在各种铁磁范德华材料的可能性。
英文摘要：
We study unconventional superconductivity in a two-dimensional locally noncentrosymmetric triangular lattice. The model is relevant to bilayer transition metal dichalcogenides with 2H$_b$ stacking structure, for example. The superconducting instability is analyzed by solving the linearized Eliashberg equation within the random phase approximation. We show that ferromagnetic fluctuations are dominant owing to the existence of disconnected Fermi pockets near van Hove singularity, and hence odd-parity spin-triplet superconductivity is favored. In the absence of the spin-orbit coupling, we find that odd-parity $f$-wave superconducting state is stabilized in a wide range of carrier density and interlayer coupling. Furthermore, we investigate impacts of the layer-dependent staggered Rashba and Zeeman spin-orbit coupling on the superconductivity. Multiple odd-parity superconducting phase diagrams are obtained as a function of the spin-orbit coupling and Coulomb interaction. Especially, a topological chiral $p$-wave pairing state is stabilized in the presence of a moderate Zeeman spin-orbit coupling. Our results shed light on a possibility of odd-parity superconductivity in various ferromagnetic van der Waals materials.
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