MIT News July 8, 2022
Despite multitudes of correlated phases observed in moiré systems, robust superconductivity appears the least common, found only in magic-angle twisted bilayer graphene (MATBG) and more recently in magic-angle twisted trilayer graphene. An international team of researchers (USA – MIT, Japan) has reported experimental realization of superconducting magic-angle twisted four-layer and five-layer graphene, hence establishing alternating twist magic-angle multilayer graphene as a robust family of moiré superconductors. This finding suggests that the flat bands shared by the members play a central role in the superconductivity. Their measurements in parallel magnetic fields reveal a clear distinction between the N = 2 and N > 2-layer structures, consistent with the difference between their orbital responses to magnetic fields. According to the researchers their results expand the emergent family of moiré superconductors, providing new insight with potential implications for design of new superconducting materials platforms…read more. TECHNICAL ARTICLE
In-plane magnetic field dependence of the superconducting states. Credit: Nature Materials (2022)