Photoemission study of a strongly coupled electron-phonon system

Authors
Hengsberger, M Purdie, D Segovia, P Garnier, M Baer, Y
Citation
M. Hengsberger et al., Photoemission study of a strongly coupled electron-phonon system, PHYS REV L, 83(3), 1999, pp. 592-595
Citations number
33
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
3
Year of publication
1999
Pages
592 - 595
Database
ISI
SICI code
0031-9007(19990719)83:3<592:PSOASC>2.0.ZU;2-S
Abstract
We present high-resolution photoemission experiments of the <(Gamma)over ba r>-surface state of Be(0001). The spectral function near the Fermi wave vec tor reveals a strong quasiparticle peak due to coupling with surface phonon modes. The coupling constant lambda is estimated to be 1.18 +/- 0.07 based on the renormalization of the effective mass. No gap was observed down to 12 K. Any interpretation of the data based on charge density wave formation or surface superconductivity can therefore be discarded.