Graphene superconductivity discovered by Cao Yuan is of great scientific significance. Cao Yuan and his research team can create this miracle by interweaving two stacked graphene sheets into a special "magic corner" and cooling the whole to a temperature slightly higher than absolute zero. This angular rotation fundamentally changes the properties of double-layer graphene: first, it becomes an insulator, and then it becomes a superconductor by applying a stronger electric field.

It is not novel that graphene can appear superconducting behavior. Researchers have previously induced the superconducting state of graphene by combining graphene with materials called superconductors or by chemical splicing with other elements.

This new discovery is so striking because it induces the superconducting properties of graphene through simple operations. Chunning Jeanie Lau, a physicist at Ohio State University, said, "That is to say, stacking two non-superconducting atomic layers in a special way can make them superconductors? I don't think anyone expected this. "

What excites the participating physicists is the way to realize this superconductivity. There are signs that this magical property of double-layer graphene comes from the strong interaction between electrons, which is called "correlation"-this behavior is considered to be the reason for the strange state of complex materials. Some complex materials, such as materials that can be superconducting at relatively high temperatures (still far below 0℃), have puzzled the physics community for more than 30 years.

If superconductivity as simple as graphene is caused by the same mechanism, graphene may become the Rosetta Stone to understand the phenomenon of high-temperature superconductivity. Understanding the phenomenon of high-temperature superconductivity, in turn, can help researchers create materials that can be superconducting near room temperature, thus completely innovating many modern technical fields, including transportation and computing.