Understanding the origin of superconductivity in correlated two-dimensional materials is a key step in leveraging material engineering techniques for next-generation nanoscale devices.While it is widely accepted that ...Understanding the origin of superconductivity in correlated two-dimensional materials is a key step in leveraging material engineering techniques for next-generation nanoscale devices.While it is widely accepted that phonons fluctuations only mediate conventional(s-wave)superconductivity,the common phenomenology of superconductivity in Bernal bilayer and rhombohedral trilayer graphene,as well as in a large family of graphene-based moirésystems,suggests a common superconducting mechanism across these platforms.In particular,in all these platforms some superconducting regions violate the Pauli limit,indicating unconventional superconductivity,naively ruling out conventional phonon-mediated pairing as the underlying mechanism.Here we combine first principles simulations with effective low-energy theories to investigate the superconducting mechanism and pairing symmetry in rhombohedral stacked graphene multilayers.展开更多
基金We acknowledge support from the Cluster of Excellence“CUI:Advanced Imaging of Matter”-EXC 2056-project ID 390715994 and SFB-925“Lightinduced dynamics and control of correlated quantum systems”-project 170620586 of the Deutsche Forschungsgemeinschaft(DFG),and Grupos Consolidados(IT1453-22)EVB acknowledges funding from the European Union’s Horizon Europe research and innovation program under the Marie Skłodowska-Curie grant agreement No 101106809.
文摘Understanding the origin of superconductivity in correlated two-dimensional materials is a key step in leveraging material engineering techniques for next-generation nanoscale devices.While it is widely accepted that phonons fluctuations only mediate conventional(s-wave)superconductivity,the common phenomenology of superconductivity in Bernal bilayer and rhombohedral trilayer graphene,as well as in a large family of graphene-based moirésystems,suggests a common superconducting mechanism across these platforms.In particular,in all these platforms some superconducting regions violate the Pauli limit,indicating unconventional superconductivity,naively ruling out conventional phonon-mediated pairing as the underlying mechanism.Here we combine first principles simulations with effective low-energy theories to investigate the superconducting mechanism and pairing symmetry in rhombohedral stacked graphene multilayers.
