Excitation and decay of aluminum bulk plasmons at the aluminum/copper phthalocyanine interface

Gianluca Di Filippo, Marco Sbroscia, Giovanni Stefani, Robert A. Bartynski, Alessandro Ruocco

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Abstract

We present the results of an experiment aimed at studying the archetypal properties of the aluminum bulk plasmon at an organic/metal interface. Electron-electron coincidence spectroscopy is used to determine the contribution of aluminum bulk plasmon decay to the ionization of a thin copper phthalocyanine film. The latter directly depends on the amplitude of the bulk plasmon electric field (generated in the metal substrate) protruding inside the molecular overlayer. The emission of low-energy electrons from the clean substrate is dominated by plasmon-assisted ionization events. These events are not observed when the molecules are adsorbed onto the surface. Our findings suggest that, for the considered system, the bulk plasmon wave is confined within the medium in which it is generated and the interaction of the plasmon field with electrons located in the molecular overlayer does not lead to the emission of low-energy electrons.

Original languageEnglish (US)
Article number235420
JournalPhysical Review B
Volume97
Issue number23
DOIs
Publication statusPublished - Jun 12 2018

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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