Spin–orbit coupling (SOC) has played an important role in many topological and correlated electron materials. In graphene-based systems, SOC induced by a transition metal dichalcogenide at close proximity has been shown to drive topological states and strengthen superconductivity. However, in rhombohedral multilayer graphene, a robust platform for electron correlation and topology, superconductivity and the role of SOC remain largely unexplored. Here we report transport measurements of transition metal dichalcogenide-proximitized rhombohedral trilayer graphene. We observed a hole-doped superconducting state SC4 with a critical temperature of 234 mK. On the electron-doped side, we noted an isospin-symmetry-breaking three-quarter-metal phase and observed that the nearby weak superconducting state SC3 is substantially enhanced. Surprisingly, the original superconducting state SC1 in bare rhombohedral trilayer graphene is strongly suppressed in the presence of transition metal dichalcogenide—opposite to the effect of SOC on all other graphene superconductivities. Our observations form the basis of exploring superconductivity and non-Abelian quasiparticles in rhombohedral graphene devices.

自旋-轨道耦合 （SOC） 在许多拓扑和相关电子材料中发挥了重要作用。在基于石墨烯的系统中，由非常接近的过渡金属二硫化物诱导的 SOC 已被证明可以驱动拓扑状态并增强超导性。然而，在菱形多层石墨烯中，一个用于电子相关和拓扑的强大平台，超导性和 SOC 的作用在很大程度上仍未得到探索。在这里，我们报告了过渡金属二硫生成物近似菱面体三层石墨烯的传输测量。我们观察到临界温度为 234 mK 的空穴掺杂超导态 SC4。在电子掺杂侧，我们注意到一个打破等旋对称性的四分之三金属相，并观察到附近的弱超导态 SC3 得到了显著增强。令人惊讶的是，裸菱面体三层石墨烯中的原始超导态 SC1 在过渡金属二硫化物存在下被强烈抑制——这与 SOC 对所有其他石墨烯超导性的影响相反。我们的观察结果构成了探索菱面体石墨烯器件中的超导和非阿贝尔准粒子的基础。