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The electron-phonon coupling strength of the (√3×√3) R30° Bi/Ag(111) surface alloy is investigated by temperature-dependent angle-resolved photoemission. The electron-phonon coupling strength for the Rashba-split surface state, as expressed by the mass-enhancement parameter λ, is found to be of the order of 0.55 with little change over the investigated binding energy range between 200 and 700 meV. This coupling is much stronger than for the clean Ag(111) surface state or for bulk Ag. It is, however, not found to increase near the the top of the band, where the density of states has a singularity. © 2011 American Physical Society.

Strongly enhanced electron-phonon coupling in the Rashba-split state of the Bi/Ag(111) surface alloy