论文标题
双层过渡金属二分法中的多个奇数超导阶段
Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides
论文作者
论文摘要
我们研究了二维局部非中心三角晶格中的非常规超导性。该模型与带有2H $ _b $堆叠结构的双层过渡金属二分法有关。通过在随机相近似中求解线性化的Eliashberg方程来分析超导不稳定。我们表明，由于Van Hove奇异性附近存在断开的费米口袋，因此铁磁波动主要是主要的，因此有利于奇怪的旋转旋转超导超导性。在没有自旋轨道耦合的情况下，我们发现奇数$ f $ - 波超导状态的稳定在各种载体密度和层间耦合中。此外，我们研究了依赖层的交错Rashba和Zeeman自旋轨道耦合对超导性的影响。获得多个奇数超导相图作为自旋轨道耦合和库仑相互作用的函数。尤其是，在有温和的Zeeman自旋轨道耦合的情况下，拓扑性手性$ P $波配对状态稳定。我们的结果揭示了各种铁磁范德华材料中奇数超导的可能性。
We study unconventional superconductivity in a two-dimensional locally noncentrosymmetric triangular lattice. The model is relevant to bilayer transition metal dichalcogenides with 2H$_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.
