Electron-phonon mass enhancement parameter of the (Gamma) over-bar surface state on Au(111) measured by photoemission spectroscopy
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We report the measurement of lambda, the electron-phonon mass enhancement parameter, for the spin-orbit-split Gamma surface state on Au(111). lambda is determined from the change of the photoemission linewidth as a function of temperature. The difference between the normal emission lambda=0.34 +/- 0.01 and midband lambda=0.30 +/- 0.01 is explained as increasing bulk penetration of the surface state as it approaches the Fermi level.