The interaction between lattice vibrations and electrons plays a key role in various aspects of condensed matter physics — including electron hydrodynamics, strange metal behavior, and high-temperature superconductivity. In this study, we present systematic investigations using Raman scattering and angle-resolved photoemission spectroscopy (ARPES) to examine the phononic and electronic subsystems of the topological superconductor candidate 2M-WS₂. Raman scattering exhibits an anomalous nonmonotonic temperature dependence of phonon linewidths, indicative of strong phonon–electron scattering over phonon–phonon scattering. The ARPES results demonstrate pronounced dispersion anomalies (kinks) at multiple binding energies within both bulk and topological surface states, indicating a robust and mode-selective coupling between the electronic states and various phonon modes. These experimental findings align with previous calculations of the Eliashberg function, providing a deeper understanding of the highest superconducting transition temperature observed in 2M-WS₂ (8.8 K) among all transition metal dichalcogenides as induced by electron–phonon coupling. Furthermore, our results may offer valuable insights into other properties of 2M-WS₂ and guide the search for high-temperature topological superconductors.

晶格振动和电子之间的相互作用在凝聚态物理的各个方面发挥着关键作用，包括电子流体动力学、奇怪的金属行为和高温超导性。在这项研究中，我们使用拉曼散射和角分辨光电子能谱（ARPES）进行系统研究，以检查拓扑超导体候选物 2M-WS ₂的声子和电子子系统。拉曼散射表现出声子线宽的异常非单调温度依赖性，表明声子-电子散射强于声子-声子散射。 ARPES 结果表明，在体态和拓扑表面态中的多个结合能处存在明显的色散异常（扭结），表明电子态和各种声子模式之间存在稳健的模式选择性耦合。这些实验结果与之前对 Eliashberg 函数的计算结果一致，使我们能够更深入地了解在所有过渡金属二硫属化物中由电子声子耦合引起的 2M-WS ₂ (8.8 K) 中观察到的最高超导转变温度。此外，我们的结果可能为了解 2M-WS ₂的其他特性提供有价值的见解，并指导高温拓扑超导体的搜索。