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Super-high resolution laser-based angle-resolved photoemission spectroscopymeasurements have been carried out on a heavily overdoped (Bi,Pb)2Sr2CuO6 (Tc>5 K) superconductor. Taking advantage of the high-precision data on the subtlechange of the quasi-particle dispersion at different temperatures, we develop ageneral procedure to determine the bare band dispersion and extract the bosonicspectral function quantitatively. Our results show unambiguously that the 70meV nodal kink is due to the electron coupling with the multiple phonon modes,with a large mass enhancement factor Lamda= 0.42 even in the heavily over-dopedregime.

physical review. b, condensed matter and materials physics

Quantitative Determination of Eliashberg Function and Evidence of Strong  Electron Coupling with Multiple Phonon Modes in Heavily Over doped  (Bi,Pb)2Sr2CuO6