Last year, physicists reported that, when chilled to 1.7°C above absolute zero (–273°C), sheets of carbon atoms two layers thick can conduct electricity without resistance, allowing electrons to whiz through the material without losing any energy. The double sheets of carbons, known as bilayer graphene, have captivated researchers because their structural simplicity offered a platform to explore the complex physics of superconductivity, which is also exhibited in copper-oxide materials at much higher temperatures. Now, researchers have discovered signs of superconductivity in easy-to-make three-layer sheets of graphene, renewing hope that layered graphene will soon help researchers understand how superconductivity occurs in copper-oxides. That could lead to higher temperature superconductors—or even room temperature ones—which could produce massive energy savings in electrical grids and devices.

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