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Graphene Gives up More of its Secrets Print
Thursday, 14 July 2011 00:00

With the Advanced Light Source Berkeley Lab scientists explore the electronic structure of graphene in regions never before tested by experiment.

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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 Feynman diagrams of such interactions. Long-range interactions, unlike those that occur only over very short distances in ordinary metals, alter the fundamental character of charge carriers in graphene. (Image by Caitlin Youngquist, Berkeley Lab Public Affairs)