Evidence for a spin acoustic surface plasmon from inelastic atom scattering

Abstract Closed-shell atoms scattered from a metal surface exchange energy and momentum with surface phonons mostly via the interposed surface valence electrons, i.e., via the creation of virtual electron-hole pairs. The latter can then decay into surface phonons via electron-phonon interaction, as...

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Autores principales:	G. Benedek, M. Bernasconi, D. Campi, I. V. Silkin, I. P. Chernov, V. M. Silkin, E. V. Chulkov, P. M. Echenique, J. P. Toennies, G. Anemone, A. Al Taleb, R. Miranda, D. Farías
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/009c1c5259b04af9a1e6f17956da07f6
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spelling	oai:doaj.org-article:009c1c5259b04af9a1e6f17956da07f62021-12-02T14:02:34ZEvidence for a spin acoustic surface plasmon from inelastic atom scattering10.1038/s41598-021-81018-92045-2322https://doaj.org/article/009c1c5259b04af9a1e6f17956da07f62021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81018-9https://doaj.org/toc/2045-2322Abstract Closed-shell atoms scattered from a metal surface exchange energy and momentum with surface phonons mostly via the interposed surface valence electrons, i.e., via the creation of virtual electron-hole pairs. The latter can then decay into surface phonons via electron-phonon interaction, as well as into acoustic surface plasmons (ASPs). While the first channel is the basis of the current inelastic atom scattering (IAS) surface-phonon spectroscopy, no attempt to observe ASPs with IAS has been made so far. In this study we provide evidence of ASP in Ni(111) with both Ne atom scattering and He atom scattering. While the former measurements confirm and extend so far unexplained data, the latter illustrate the coupling of ASP with phonons inside the surface-projected phonon continuum, leading to a substantial reduction of the ASP velocity and possibly to avoided crossing with the optical surface phonon branches. The analysis is substantiated by a self-consistent calculation of the surface response function to atom collisions and of the first-principle surface-phonon dynamics of Ni(111). It is shown that in Ni(111) ASP originate from the majority-spin Shockley surface state and are therefore collective oscillation of surface electrons with the same spin, i.e. it represents a new kind of collective quasiparticle: a Spin Acoustic Surface Plasmon (SASP).G. BenedekM. BernasconiD. CampiI. V. SilkinI. P. ChernovV. M. SilkinE. V. ChulkovP. M. EcheniqueJ. P. ToenniesG. AnemoneA. Al TalebR. MirandaD. FaríasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q G. Benedek M. Bernasconi D. Campi I. V. Silkin I. P. Chernov V. M. Silkin E. V. Chulkov P. M. Echenique J. P. Toennies G. Anemone A. Al Taleb R. Miranda D. Farías Evidence for a spin acoustic surface plasmon from inelastic atom scattering
description	Abstract Closed-shell atoms scattered from a metal surface exchange energy and momentum with surface phonons mostly via the interposed surface valence electrons, i.e., via the creation of virtual electron-hole pairs. The latter can then decay into surface phonons via electron-phonon interaction, as well as into acoustic surface plasmons (ASPs). While the first channel is the basis of the current inelastic atom scattering (IAS) surface-phonon spectroscopy, no attempt to observe ASPs with IAS has been made so far. In this study we provide evidence of ASP in Ni(111) with both Ne atom scattering and He atom scattering. While the former measurements confirm and extend so far unexplained data, the latter illustrate the coupling of ASP with phonons inside the surface-projected phonon continuum, leading to a substantial reduction of the ASP velocity and possibly to avoided crossing with the optical surface phonon branches. The analysis is substantiated by a self-consistent calculation of the surface response function to atom collisions and of the first-principle surface-phonon dynamics of Ni(111). It is shown that in Ni(111) ASP originate from the majority-spin Shockley surface state and are therefore collective oscillation of surface electrons with the same spin, i.e. it represents a new kind of collective quasiparticle: a Spin Acoustic Surface Plasmon (SASP).
format	article
author	G. Benedek M. Bernasconi D. Campi I. V. Silkin I. P. Chernov V. M. Silkin E. V. Chulkov P. M. Echenique J. P. Toennies G. Anemone A. Al Taleb R. Miranda D. Farías
author_facet	G. Benedek M. Bernasconi D. Campi I. V. Silkin I. P. Chernov V. M. Silkin E. V. Chulkov P. M. Echenique J. P. Toennies G. Anemone A. Al Taleb R. Miranda D. Farías
author_sort	G. Benedek
title	Evidence for a spin acoustic surface plasmon from inelastic atom scattering
title_short	Evidence for a spin acoustic surface plasmon from inelastic atom scattering
title_full	Evidence for a spin acoustic surface plasmon from inelastic atom scattering
title_fullStr	Evidence for a spin acoustic surface plasmon from inelastic atom scattering
title_full_unstemmed	Evidence for a spin acoustic surface plasmon from inelastic atom scattering
title_sort	evidence for a spin acoustic surface plasmon from inelastic atom scattering
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/009c1c5259b04af9a1e6f17956da07f6
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_version_	1718392061425614848

Evidence for a spin acoustic surface plasmon from inelastic atom scattering

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