Abstract:
:Femtosecond and subfemtosecond time scales typically rule electron dynamics at metal surfaces. Recent advance in experimental techniques permits now remarkable precision in the description of these processes. In particular, shorter time scales, smaller system sizes, and spin-dependent effects are current targets of interest. In this article, we use state-of-the-art theoretical methods to analyze these refined features of electron dynamics. We show that the screening of localized charges at metal surfaces is created locally in the attosecond time scale, while collective excitations transfer the perturbation to larger distances in longer time scales. We predict that the elastic width of the resonance in excited alkali adsorbates on ferromagnetic surfaces can depend on spin orientation in a counterintuitive way. Finally, we quantitatively evaluate the electron-electron and electron-phonon contributions to the electronic excited states widths in ultrathin metal layers. We conclude that confinement and spin effects are key factors in the behavior of electron dynamics at metal surfaces.
journal_name
Proc Natl Acad Sci U S Aauthors
Muiño RD,Sánchez-Portal D,Silkin VM,Chulkov EV,Echenique PMdoi
10.1073/pnas.1008517107subject
Has Abstractpub_date
2011-01-18 00:00:00pages
971-6issue
3eissn
0027-8424issn
1091-6490pii
1008517107journal_volume
108pub_type
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