Insulator or superconductor? Physicists find graphene is both

Insulator or superconductor? Physicists find graphene is both

Physicists at MIT and Harvard University have found that graphene, a lacy, honeycomb-like sheet of carbon atoms, can behave at two electrical extremes: as an insulator, in which electrons are completely blocked from flowing; and as a superconductor, in which electrical current can stream through without resistance.

Source: mit.edu