Long-range Interactions in Graphene (IMAGE)
Caption
Undoped graphene isn't a metal, semiconductor, or insulator but a semimetal, whose unusual properties include electron-electron interactions between particles widely separated on graphene's honeycomb lattice -- here suggested by an artist's impression of the Feynman diagrams often used to keep track of such interactions. Interactions occur over only very short distances in ordinary metals. Long-range interaction alter the fundamental character of charge carriers in graphene.
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Image by Caitlin Youngquist, Lawrence Berkeley National Laboratory
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