Paper detail

Extreme Anisotropy in the Metallic and Superconducting Phases of Rhombohedral Hexalayer Graphene

In strongly correlated electronic systems, Coulomb interactions frequently manifest through emergent electronic orders that spontaneously break rotational symmetry. Understanding how such symmetry breaking intertwines with other collective phenomena -- such as unconventional superconductivity -- and how it shapes experimental observables, particularly transport responses, remains a central challenge in modern condensed matter physics. Here, we report a metallic phase with extreme transport anisotropy in rhombohedral hexalayer graphene, with an anisotropy ratio rivaling that of quantum Hall stripe phases. At low temperature, a superconducting state emerges from this metallic phase. Strikingly, the superconductor not only inherits strong anisotropy but also exhibits a wide range of hysteretic transitions arising from the tunability of the underlying anisotropic order. Together, these findings reveal a previously unrecognized coexistence between superconductivity and extreme transport anisotropy, shedding new light on the role of rotational symmetry breaking in shaping unconventional superconductivity in rhombohedral graphene.