Novel quantum effect discovered in naturally occurring graphene

Scanning electron microscope image of a contacted, two-atom-thick, free-floating graphene flake with a free-floating metal bridge hovering above it. Credit: Fabian Geisenhof/Jakob Lenz Usually, the electrical resistance of a material depends very much on its physical dimensions and fundamental properties. Under special circumstances, however, this resistance can adopt a fixed value that is independent of…
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