Role of elastic scattering in electron dynamics at ordered alkali overlayers on Cu(111).
Scanning tunneling spectroscopy of p(2 x 2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi-two-dimensional quantum well states despite largely different binding energies. Detailed calculations show that 50% of the line widths are due to electron-phonon scattering while inelastic electron-electron scattering is negligible. The mechanism of enhanced elastic scattering due to Brillouin zone backfolding contributes the remaining width.
Corriol
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C
Donostia International Physics Center, Paseo Manuel de Lardizabal 4, San Sebastian 20018, Spain.
Silkin
V M
VM
Sánchez-Portal
D
D
Arnau
A
A
Chulkov
E V
EV
Echenique
P M
PM
von Hofe
T
T
Kliewer
J
J
Kröger
J
J
Berndt
R
R