Physorg March 5, 2018
An international team of researchers (USA – MIT, Harvard University, Japan) created a “superlattice” of two graphene sheets stacked together at a “magic angle” of 1.1 degrees creating a precise moiré configuration. They found that at the magic angle, the two sheets of graphene exhibit nonconducting behavior similar to Mott insulators. When they applied voltage by adding small amounts of electrons to the graphene superlattice, at a certain level, the electrons broke out of the initial insulating state and flowed without resistance, as if through a superconductor. The finding provides a platform for investigating unconventional superconductivity, making a superconducting transistor out of graphene which can switch on and off, from superconducting to insulating and opens many possibilities for quantum devices… read more. TECHNICAL ARTICLE
Physicists at MIT and Harvard University have found that graphene can behave at two electrical extremes: as an insulator and as a superconductor. Credit: MIT