We study possible superconducting states in transition metal dichalcogenide (TMD) monolayers, assuming an on-site pairing potential that includes both intra- and inter-orbital terms. We find that if the mirror symmetry with respect to the system’s plane is broken (e.g., by a substrate), this type of pairing can give rise to unconventional superconductivity, including time-reversal-invariant nodal and fully gapped topological phases. Using a multi-orbital renormalization group procedure, we show how these phases may result from the interplay between the local Coulomb repulsion, Hund’s rule coupling, and phonon-mediated attraction. In particular, for a range of interaction parameters, the system transitions from a trivial phase to a nodal phase and finally to a gapped topological phase upon increasing the strength of the mirror symmetry breaking term.

我们研究了过渡金属二硫属化物 (TMD) 单层中可能的超导状态，假设现场配对潜力包括轨道内和轨道间项。我们发现，如果相对于系统平面的镜像对称性被破坏（例如，被衬底破坏），这种类型的配对会产生非常规的超导性，包括时间反转不变的节点和完全有间隙的拓扑相。使用多轨道重整化群程序，我们展示了这些阶段如何由局部库仑排斥、洪德规则耦合和声子介导的吸引力之间的相互作用产生。特别是对于一系列交互参数，