Researchers have presented new evidence of how graphene, folded at specific angles, can
In an ordinary metal, conductivity is responsiblehigh speed electrons. But the structure of twisted two-layer graphene is different in that the electrons in it move very slowly - in fact, at a speed approaching zero.
According to the traditional theory of superconductivity,they don't have to conduct electricity, explains study co-author Jeanie Lau, also a professor of physics at Ohio State. However, scientists used "quantum geometry", write the authors of the study. They considered the electron - it is not only a particle, but also a wave. This means that it has wave functions.
As a result, the irradiated graphene sample showed superconductivity.
The geometry of quantum wave functions in flat bands, together with the interaction between electrons, leads to the flow of electric current in the material without dissipation, physicists explain.
“We have found that ordinary equations canexplain about 10% of the superconductivity signal we detected. Our experimental measurements show that quantum geometry is 90% of what makes it a superconductor,” the study authors conclude.
So far, the superconducting effects of this material can only be detected in experiments at extremely low temperatures.
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