Effective mass and momentum-resolved intrinsic linewidth of image-potential states on Ag(100)

Gabriele Ferrini, Claudio Giannetti, Daniele Fausti, Gianluca Galimberti, Marco Peloi, Fulvio Parmigiani, Gianpiero Banfi

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

12 Citazioni (Scopus)

Abstract

The intrinsic linewidth of Ag(100) electronic image-potential states versus the momentum parallel to the surface has been obtained from line-shape analysis of high-resolution angle-resolved two-photon photoemission spectra. For the n=1 state, the measured intrinsic linewidths have been observed to increase from 14 meV at normal emission (k(parallel to)=0) to 70 meV at k(parallel to)=0.18 Angstrom(-1). This finding, when compared to the significantly lower inverse lifetime broadening measured on Cu(100), opens the question of the interplay between collective particle effects and nonlocal mechanisms associated with the image-potential electrons decay dynamics. In addition, the effective electron masses for the n=1 and n=2 states, observed in our experiments along the (&UGamma;) over bar(M) over bar and (&UGamma;) over bar(X) over bar directions of the surface Brillouin zone, improve the agreement between the measured values and the theoretical predictions.
Lingua originaleEnglish
pagine (da-a)N/A-N/A
Numero di pagine235407
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume67
DOI
Stato di pubblicazionePubblicato - 2003

Keywords

  • 2-PHOTON PHOTOEMISSION SPECTROSCOPY
  • ELECTRONIC STATES
  • FEMTOSECOND DYNAMICS
  • LIFETIMES
  • SILVER
  • SURFACES

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