Acoustic Plasmon on the Au(111) Surface

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Authors

Colleges, School and Institutes

Abstract

We report an acoustic surface plasmon mode on the Au(111) surface, which disperses into the visible region, as measured by high resolution electron energy loss spectroscopy. The new mode is assigned to an acoustic surface plasmon arising from the Shockley-type surface state electrons and coexists with the conventional surface plasmon. This low energy collective excitation disperses linearly up to similar to 2.2 eV, i.e., into the visible region. The divergence from theoretical prediction appears to emphasize the importance of band structure effects upon the dielectric function of the surface region.

Details

Original languageEnglish
Pages (from-to)016801
Number of pages1
JournalPhysical Review Letters
Volume105
Issue number1
Publication statusPublished - 1 Jul 2010