Last year, experimentalists at Harvard University in the US made an unexpected discovery: three layers of graphene are better than two at conducting electricity without resistance. At the time, the reasons for this unusual superconducting behaviour were unclear. Now, however, theorists in Austria and Israel have come up with an explanation that sheds more light on the origins of superconductivity in trilayer graphene, while also helping to explain other anomalies in recent experiments on this two-dimensional carbon material.
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