Observation of carrier-density-dependent many-body effects in graphene via tunneling spectroscopy.
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.
Brar
Victor W
VW
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Wickenburg
Sebastian
S
Panlasigui
Melissa
M
Park
Cheol-Hwan
CH
Wehling
Tim O
TO
Zhang
Yuanbo
Y
Decker
Régis
R
Girit
Cağlar
C
Balatsky
Alexander V
AV
Louie
Steven G
SG
Zettl
Alex
A
Crommie
Michael F
MF