Workshop
Graphene Research
Hosts:
A. Lanzara
Determining Order using X-ray Scattering
ARPES experiments measure the one-particle spectral function of
electrons in a solid. The simplest approximation for the
spectral function is the random phase approximation (RPA)
which treats electron-electron interactions at lowest order, but accounts
for
dynamic screening. In the case of graphene, the RPA predicts unusual
structure in the spectral function at wavevectors near the Dirac point
which reflect strong interactions between holes and plasmon excitations of
the Fermi sea.
I will explain the special features of graphene's electronic structure
which are responsible for the strong plasmon-hole interaction
and comment on comparisons between RPA spectral functions
and experiment.
F. Wang
Y. Zhang