title: Observation of carrier-density-dependent many-body effects in graphene via tunneling spectroscopy.
abstract: We find the scanning tunneling spectra of backgated graphene monolayers to be significantly altered by many-body excitations. Experimental features in the spectra arising from electron-plasmon interactions show carrier density dependence, distinguishing them from density-independent electron-phonon features. Using a straightforward model, we are able to calculate theoretical tunneling spectra that agree well with our data, providing insight into the effects of many-body interactions on the lifetime of graphene quasiparticles.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Victor W
authors.initials: VW
authors.lastname: Brar
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wickenburg
authors.forename: Melissa
authors.initials: M
authors.lastname: Panlasigui
authors.forename: Cheol-Hwan
authors.initials: CH
authors.lastname: Park
authors.forename: Tim O
authors.initials: TO
authors.lastname: Wehling
authors.forename: Yuanbo
authors.initials: Y
authors.lastname: Zhang
authors.forename: Régis
authors.initials: R
authors.lastname: Decker
authors.forename: Cağlar
authors.initials: C
authors.lastname: Girit
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Balatsky
authors.forename: Steven G
authors.initials: SG
authors.lastname: Louie
authors.forename: Alex
authors.initials: A
authors.lastname: Zettl
authors.forename: Michael F
authors.initials: MF
authors.lastname: Crommie