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Electrons are marvelous little things. They often hang about orbiting atomic nuclei, but they don't have to – the Universe is full of loose electrons rattling about.they didn't have to rattle about, either: that free electrons may be forced together in a peculiar kind of matter that has no atoms at all, just electrons trapped by their own repulsion a neat, crystalline lattice.
"Visualizing this crystal allows us not only to watch its formation, confirming many of its properties, but we can also study it in ways you couldn't in the past." At extremely low temperatures and at low densities, the repulsive interaction between electrons should, he theorized, see their potential energy dominate their need to zoom about, causing them to fall into crystal-like lattice arrangements.
Two sheets of graphene were prepared and arranged in a specific configuration before being cooled to just a fraction above absolute zero. A magnetic field was then applied to tune the density of the electron gas sandwiched between the layers.
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