Plasmon dispersion and damping in electrically isolated two-dimensional charge sheets

2008 
Using high-resolution reflection electron-energy-loss spectroscopy (HREELS), we compare experimental results for the wave-vector-dependent behavior of plasmons in a graphene sheet on SiC(0001) with that due to a filled band of surface states on semiconducting silicon. There are significant differences in behavior between the two systems and the behavior predicted for a classical two-dimensional sheet of electrons. In particular, the damping increases with wave vector independent of any obvious inelastic scattering channel. The results illustrate the importance of finite-momentum, nonlocal potential effects for the dynamical behavior of electrically isolated charge sheets.
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    0
    References
    190
    Citations
    NaN
    KQI
    []