Evidence for a spin acoustic surface plasmon from inelastic atom scattering
| Autor: | Daniel Farías, Davide Campi, Eugene V. Chulkov, Igor V. Silkin, Amjad Al Taleb, Marco Bernasconi, Ivan P. Chernov, Pedro M. Echenique, Rodolfo Miranda, Giorgio Benedek, Gloria Anemone, J. P. Toennies, Viatcheslav M. Silkin |
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| Přispěvatelé: | UAM. Departamento de Física de la Materia Condensada, Ministry of Science and Higher Education of the Russian Federation, Tomsk State University, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Saint Petersburg State University, Ministerio de Economía y Competitividad (España), Benedek, G, Bernasconi, M, Campi, D, Silkin, I, Chernov, I, Silkin, V, Chulkov, E, Echenique, P, Toennies, J, Anemone, G, Al Taleb, A, Miranda, R, Farias, D |
| Rok vydání: | 2021 |
| Předmět: |
surface physic
Phonon diffraction localized dynamic perturbations 02 engineering and technology Electron Electron-Gas 01 natural sciences поверхностные плазмоны vibrations plasmon Atom Condensed-matter physics FIS/03 - FISICA DELLA MATERIA Physics density Multidisciplinary Total-Energy Calculations Avoided crossing Surface plasmon 021001 nanoscience & nanotechnology неупругое рассеяния Quasiparticle Medicine Phonons Condensed Matter::Strongly Correlated Electrons Atomic physics 0210 nano-technology Diffraction NI ni Electronic properties and materials Metal-Surfaces Science atom scattering electron-gas Localized Dynamic Perturbations phonons Article 0103 physical sciences 010306 general physics density functional theory атомы поверхностные фононы Scattering metal-surfaces excitation Física total-energy calculations Valence electron |
| Zdroj: | Biblos-e Archivo. Repositorio Institucional de la UAM instname Addi. Archivo Digital para la Docencia y la Investigación Digital.CSIC. Repositorio Institucional del CSIC Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021) Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia Scientific Reports Addi: Archivo Digital para la Docencia y la Investigación Universidad del País Vasco Scientific Reports [Еlectronic resource]. 2021. Vol. 11. P. 1506 (1-12) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-021-81018-9 |
| Popis: | 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). The work of I.V.S. is supported by the Ministry of Science and Higher Education of the Russian Federation for funding in framework of State Task (No. 0721-2020-0033). V.M.S. and P.M.E. acknowledge support from the Spanish Ministry of Science and Innovation (Grant No. PID2019-105488GB-I00) and D.F. from Grant No. PID2019-109525RB-I00. E.V.C. acknowledges support from Saint Petersburg State University (project ID No. 51126254). R.M. and D.F. acknowledge financial support from the Spanish Ministry of Economy and Competitiveness, through the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). IMDEA Nanociencia acknowledges support from the ’Severo Ochoa’ Programme for Centres of Excellence in R&D (MINECO, Grant SEV-2016-0686). Part of the calculations was performed at the SKIF-Cyberia supercomputer at the National Research Tomsk State University (Russian Federation) and the Supercomputer Center of D.I.P.C. (Spain). |
| Databáze: | OpenAIRE |
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