Six-layer rhombohedral graphene shows new superconducting and electrically switchable magnetic states

Rhombohedral multilayer graphene has become a platform for exploring correlated and topological quantum phases, thanks to flat electronic bands that carry Berry curvature. Earlier studies mostly looked at the regime where the conduction and valence bands are separated. The new work explores the semimetallic regime of the six-layer material, in which the two bands overlap and electrons and holes coexist.

Researchers at Cornell University, the National Institute for Materials Science (Japan) and the Max Planck Institute for the Structure and Dynamics of Matter have found new superconducting and magnetic states in rhombohedral hexalayer graphene, a stack of six graphene layers arranged in a staggered, repeating pattern.Rhombohedral multilayer graphene has become a platform for exploring correlated and topological quantum phases, thanks to flat electronic bands that carry Berry curvature. Earlier studies mostly looked at the regime where the conduction and valence bands are separated. The new work explores the semimetallic regime of the six-layer material, in which the two bands overlap and electrons and holes coexist.

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