Spatially resolved quantum plasmon modes in metallic nano-films from first principles

  title={Spatially resolved quantum plasmon modes in metallic nano-films from first principles},
  author={Kirsten Andersen and Karsten Wedel Jacobsen and Kristian Sommer Thygesen},
  journal={arXiv: Mesoscale and Nanoscale Physics},
Electron energy loss spectroscopy (EELS) can be used to probe plasmon excitations in nanostructured materials with atomic-scale spatial resolution. For structures smaller than a few nanometers quantum effects are expected to be important, limiting the validity of widely used semi-classical response models. Here we present a method to identify and compute spatially resolved plasmon modes from first principles based on a spectral analysis of the dynamical dielectric function. As an example we… 

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We note that exact solutions may be obtained for complex frequencies. However, this requires an analytical continuation of into the complex plane and will not be pursued in the present work