Abstract
We present calculation results for electron–phonon (e–ph) coupling in one monolayer (ML) of Na on the Cu(1 1 1) surface. We show that the e–p coupling parameter λ decreases compared to that for clean Cu(1 1 1) due to the significant decrease of the Na vertical vibrational mode contribution to the Eliashberg function in the 1 ML Na/Cu(1 1 1) system. The corresponding phonon induced lifetime broadening Γ e–ph of a quantum-well state at low temperature decreases by 30% compared to that on clean Cu(1 1 1).
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