Low-energy acoustic plasmons at metal surfaces

Bogdan Diaconescu, Karsten Pohl (), Luca Vattuone, Letizia Savio, Philip Hofmann, Vyacheslav M. Silkin, Jose M. Pitarke, Eugene V. Chulkov, Pedro M. Echenique, Daniel Farías and Mario Rocca
Additional contact information
Bogdan Diaconescu: University of New Hampshire, Durham, New Hampshire 03824, USA
Karsten Pohl: University of New Hampshire, Durham, New Hampshire 03824, USA
Luca Vattuone: Università di Genova, 16146 Genova, Italy
Letizia Savio: Università di Genova, 16146 Genova, Italy
Philip Hofmann: Institute for Storage Ring Facilities and Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, 8000 Aarhus C, Denmark
Vyacheslav M. Silkin: Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain
Jose M. Pitarke: CIC nanoGUNE Consolider and Materia Kondentsatuaren Fisika Saila, UPV/EHU, Mikeletegi Pasealekua 56, E-2009 Donostia, Basque Country, Spain
Eugene V. Chulkov: Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain
Pedro M. Echenique: Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain
Daniel Farías: Universidad Autónoma de Madrid, 28049 Madrid, Spain
Mario Rocca: Università di Genova, 16146 Genova, Italy

Nature, 2007, vol. 448, issue 7149, 57-59

Abstract: The 'impossible' plasmon At the surface of a metal, collective electronic excitations such as surface plasmons are possible, and these can be exploited for a wide range of applications in microscopy and photonics. Now a new type of plasmon has been observed, one previously considered an impossibility on a metal surface. It has a much lower energy than the conventional type, so it was thought that it would be destroyed by the underlying bulk electrons in the metal. But this new plasmon, which has acoustic (or linear) dispersion, has an electronic structure that can coexist with the electron continuum of the bulk. The acoustic plasmon is likely to exist on many metal surfaces, and will be of particular relevance to nano-optics and photonics applications.

Date: 2007
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DOI: 10.1038/nature05975

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