Anisotropic Dispersion and Partial Localization of Acoustic Surface Plasmons on an Atomically Stepped Surface: Au(788)

M. Smerieri, L. Vattuone, L. Savio, T. Langer, C. Tegenkamp, H. Pfnür, V. M. Silkin, and M. Rocca
Phys. Rev. Lett. 113, 186804 – Published 29 October 2014
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Abstract

Understanding acoustic surface plasmons (ASPs) in the presence of nanosized gratings is necessary for the development of future devices that couple light with ASPs. We show here by experiment and theory that two ASPs exist on Au(788), a vicinal surface with an ordered array of monoatomic steps. The ASPs propagate across the steps as long as their wavelength exceeds the terrace width, thereafter becoming localized. Our investigation identifies, for the first time, ASPs coupled with intersubband transitions involving multiple surface-state subbands.

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  • Received 21 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.186804

© 2014 American Physical Society

Authors & Affiliations

M. Smerieri1, L. Vattuone1,2,*, L. Savio1, T. Langer3, C. Tegenkamp3, H. Pfnür3, V. M. Silkin4,5,6, and M. Rocca1,2

  • 1IMEM-CNR Unitá Operativa di Genova, Via Dodecaneso 33, 16146 Genova, Italy
  • 2Dipartimento di Fisica dell’Universitá di Genova, Via Dodecaneso 33, 16146 Genova, Italy
  • 3Institut für Festkörperphysik, Abteilung Atomare und Molekulare Strukturen, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany
  • 4Departamento de Física de Materiales, Facultad de Ciencias Químicas, Universidad del País Vasco, Apartado 1072, 20080 San Sebastián/Donostia, Spain
  • 5Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal 4, 20018 San Sebastián/Donostia, Spain
  • 6IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain

  • *Corresponding author. vattuone@fisica.unige.it

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Vol. 113, Iss. 18 — 31 October 2014

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