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Influence of Electron Quantum Confinement on the Electronic Response of Metal/Metal Interfaces

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Reviews in Plasmonics 2010

Part of the book series: Reviews in Plasmonics ((RIP,volume 2010))

Abstract

Herein we report on high-resolution electron energy loss spectroscopy (HREELS) measurements on surface plasmon dispersion in systems exhibiting quantum well states (QWS), i.e., Na/Cu(111), Ag/Cu(111), and Ag/Ni(111). Our results demonstrate that the dominant coefficient of surface plasmon dispersion for thin and layer-by-layer Ag films presenting QWS is quadratic even at small q∥, in contrast with previous measurements on Ag semi-infinite media and Ag thin films deposited on Si(111). We suggest that this behavior is due to screening effects enhanced by the presence of QWS shifting the position of the centroid of the induced charge less inside the geometrical surface compared to Ag surfaces and Ag/Si(111). For ultrathin Ag films, i.e., two layers, the dispersion was found to be not positive, as theoretically predicted. Annealing of the Ag film caused an enhancement of the free-electron character of the QWS, thus inducing a negative linear term of the dispersion curve of the surface plasmon. Moreover, we report the first experimental evidence of chemical interface damping in thin films for K/Ag/Ni(111). As regards Na/Cu(111), we found a different dispersion curve compared to thick Na films, thus confirming the enhanced screening by Na QWS.Results reported here should shed light on the influence of QWS on dynamical screening phenomena in thin films.

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Acknowledgments

We want to thank Dr. Stefan Mathias and Prof. Michael Bauer for having allowed to use their photoemission data, and, moreover, dr. Vincenzo Formoso for many helpful discussions.

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Authors and Affiliations

  1. Dipartimento di Fisica, Università degli Studi della Calabria, 87036, Rende (Cs), Italy

    Antonio Politano & Gennaro Chiarello

  2. Departamento de Fisica de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain

    Antonio Politano

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  1. Antonio Politano
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  2. Gennaro Chiarello
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Correspondence to Antonio Politano .

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  1. Institute of Fluorescence, University of Maryland, E. Pratt St. 701, BALTIMORE, 21202, Maryland, USA

    Chris D. Geddes

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Politano, A., Chiarello, G. (2012). Influence of Electron Quantum Confinement on the Electronic Response of Metal/Metal Interfaces. In: Geddes, C. (eds) Reviews in Plasmonics 2010. Reviews in Plasmonics, vol 2010. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0884-0_3

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