Plasmon dispersion in quasi-freestanding graphene on Ni(111)

Abstract

The electronic properties of graphene formed on Ni(111) by chemical vapor deposition and intercalated with Cs atoms have been studied by angle-resolved electron-energy-loss spectroscopy. The dispersion curve of π plasmon, in comparison with the analogous dispersion curve obtained in the absence of intercalated Cs, shows that alkali metal atoms make graphene to be quasi-free, with a much lowered charge transfer, and with the recovery of the π band linearity at Dirac points.

Electronic structure and magnetic properties of cobalt intercalated in graphene on Ir(111)

“…In the case of graphene on metals, the ability of intercalated chemical species to decouple graphene from the Ni(111), recovering the Dirac fermion character of its collective excitations (phonon [9,[14][15][16] and plasmon [17,18] modes) and its valence band [10,19], was already discovered [12] before the current rush of publications.…”

The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

“…all particles move coherently with a common frequency and wave-vector [171][172][173][174][175][176][177][178][179][180][181]. Plasmons are quantized wave-like excitations in a plasma, i.e.…”

Even Hard-Sphere Colloidal Suspensions Display Fickian Yet Non-Gaussian Diffusion

“…[14][15][16] These low-energy plasmons, which appear at mid-infrared and lower frequencies, should not be confused with the higher-energy π and σ plasmons that show up in most carbon allotropes, and that have been extensively studied through electron energy-loss spectroscopy (EELS) in fullerenes, 17,18 nanotubes, 19 and graphene. [20][21][22][23] These high-energy plasmons are not electrically tunable. We thus concentrate on electrically driven low-energy plasmons in graphene.…”