Evidence for a spin acoustic surface plasmon from inelastic atom scattering
| Источник: | Scientific Reports Vol. 11, iss. 1.— 2021.— [1506, 12 p.] |
|---|---|
| Автор-организация: | |
| Другие авторы: | , , , , , , , , , , , , |
| Примечания: | Title screen 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). |
| Язык: | английский |
| Опубликовано: |
2021
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| Предметы: | |
| Online-ссылка: | https://doi.org/10.1038/s41598-021-81018-9 |
| Формат: | Электронный ресурс Статья |
| Запись в KOHA: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664410 |
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| 200 | 1 | |a Evidence for a spin acoustic surface plasmon from inelastic atom scattering |f G. Benedek, M. Bernasconi, D. Campi [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 84 tit.] | ||
| 330 | |a 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). | ||
| 461 | |t Scientific Reports | ||
| 463 | |t Vol. 11, iss. 1 |v [1506, 12 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
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| 610 | 1 | |a electronic properties and materials | |
| 610 | 1 | |a physics | |
| 610 | 1 | |a конденсированные состояния | |
| 610 | 1 | |a электронные свойства | |
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| 701 | 1 | |a Bernasconi |b M. | |
| 701 | 1 | |a Campi |b D. |g Davide | |
| 701 | 1 | |a Silkin |b I. V. |g Igor Vyacheslavovich | |
| 701 | 1 | |a Chernov |b I. P. |c Doctor of Physical and Mathematical Sciences (DSc), Professor of the Department of General Physics of Tomsk Polytechnic University (TPU) |f 1935- |g Ivan Petrovich |3 (RuTPU)RU\TPU\pers\30202 |9 14596 | |
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