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Role of Elastic Scattering in Electron Dynamics at Ordered Alkali Overlayers on Cu(111)

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 …