Superconductivity in twisted transition metal dichalcogenide homobilayers

For the first time, robust superconductivity has been independently observed in twisted WSe₂ bilayers by two separate groups Y. Xia et al. , arXiv: 2405. 14784; Y. Guo et al. , arXiv: 2406. 03418. . In light of this, we explore the possibility of a universal superconducting pairing mechanism in twisted WSe₂ bilayers. Using a continuum band structure model and a phenomenological boson-mediated effective electron-electron attraction, we find that intervalley intralayer pairing predominates over interlayer pairing. Notably, despite different experimental conditions, both twisted WSe₂ samples exhibit a comparable effective attraction strength. This consistency suggests that the dominant pairing glue is likely independent of the twist angle and layer polarization, pointing to a universal underlying boson-induced pairing mechanism.