The superconductivity of layered graphene is surprisingly strange
An illustration representing the ultra-thin material grapheneScience Photo Library/Alamy
Why do cold thin sheets of carbon offer no resistance to electric currents? Two experiments are bringing us closer to an answer – and maybe even to practical room-temperature superconductors.
Kin Chung Fong at Northeastern University in Massachusetts was stunned when another physicist, Abhishek Banerjee at Harvard University, told him a number over dinner. They were studying different aspects of graphene – sheets of carbon only one atom thick – but both made the same estimate about how hard it should be for an electric current flowing through graphene to suddenly change.
Past experiments have shown that very cold stacks of two or three layers of graphene can superconduct, or p...