Electron-phonon mass enhancement parameter of the (Gamma) over-bar surface state on Au(111) measured by photoemission spectroscopy
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CitationLaShell, S., McDougall, B., & Jensen, E. (2006). Electron-phonon mass enhancement parameter of the (gamma)over-bar surface state on au(111) measured by photoemission spectroscopy. PHYSICAL REVIEW B, 74(3), 1-3. doi:10.1103/PhysRevB.74.033410
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.