acoustic surface plasmon
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2021 ◽  
Vol 11 (1) ◽  
Author(s):  
G. Benedek ◽  
M. Bernasconi ◽  
D. Campi ◽  
I. V. Silkin ◽  
I. P. Chernov ◽  
...  

AbstractClosed-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).


2013 ◽  
Vol 117 (51) ◽  
pp. 26964-26968 ◽  
Author(s):  
Jan Pischel ◽  
Emanuel Welsch ◽  
Olaf Skibbe ◽  
Annemarie Pucci

2012 ◽  
Vol 86 (8) ◽  
Author(s):  
M. Jahn ◽  
M. Müller ◽  
M. Endlich ◽  
N. Néel ◽  
J. Kröger ◽  
...  

Plasmonics ◽  
2011 ◽  
Vol 7 (2) ◽  
pp. 323-329 ◽  
Author(s):  
Luca Vattuone ◽  
Gabriele Vercelli ◽  
Marco Smerieri ◽  
Letizia Savio ◽  
Mario Rocca

2010 ◽  
Vol 90 (5) ◽  
pp. 57006 ◽  
Author(s):  
K. Pohl ◽  
B. Diaconescu ◽  
G. Vercelli ◽  
L. Vattuone ◽  
V. M. Silkin ◽  
...  

2008 ◽  
Vol 205 (6) ◽  
pp. 1307-1311 ◽  
Author(s):  
V. M. Silkin ◽  
J. M. Pitarke ◽  
E. V. Chulkov ◽  
B. Diaconescu ◽  
K. Pohl ◽  
...  

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