Observation of Plasmarons in Quasi-Freestanding Doped Graphene

Abstract

More Crossings for Graphene Graphene, which consists of single sheets of graphite, has a number of distinctive electronic properties, including a conical structure that leads to a “Dirac point” where the valence and conduction band intersect at a zero-energy point. Bostwick et al. (p. 999 ) used angle-resolved photoemission spectroscopy to study graphene that was doped with alkali atoms and suspended from its substrate. They observed features associated with plasmarons, which arise from the interaction of the charge carriers with plasmons, the density oscillations of the electron gas. The Dirac crossing now becomes three crossings: one that involves charge bands, one involving plasmarons, and one involving the interaction between the two.