The discovery could inform the design of practical superconducting devices. When it comes to graphene, it appears that superconductivity runs in the family. Graphene is a single-atom-thin 2D material that can be produced by exfoliation from the same graphite that is found in pencil lead. The u
scientists discovered that if two graphene layers are stacked at a very specific “magic” angle, the twisted bilayer structure could exhibit robust. In this widely sought material state, an electrical current can flow through with zero energy loss. Recently, the same group of researchers found a similar superconductive state exists in twisted trilayer graphene — a structure made from three graphene layers stacked at a precise, new magic angle.
“The magic-angle graphene system is now a legitimate ‘family,’ beyond a couple of systems,” says lead author Jeong Min Park, a graduate student in MIT’s Department of Physics. “Having this family is particularly meaningful because it provides a way to design robust superconductors.” While the researchers observed that twisted bilayer graphene exhibited both superconductivity and a flat band structure, it wasn’t clear whether the former arose from the latter.
“They worked out there may be this entire hierarchy of graphene structures, to infinite layers, that might correspond to a similar mathematical expression for a flat band structure,” Park says. The team kept the structures in a refrigerator below 1 kelvin , ran electrical current through each structure, and measured the output under various conditions, similar to tests for their bilayer and trilayer systems.
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