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High resolution laser-based angle-resolved photoemission measurements havebeen carried out on Bi2Sr2CuO6+d superconductor covering a wide doping rangefrom heavily underdoped to heavily overdoped samples. Two obvious energy scalesare identified in the nodal dispersions: one is the well-known 50-80 meV highenergy kink and the other is <10 meV low energy kink. The high energy kinkincreases monotonously in its energy scale with increasing doping and showsweak temperature dependence, while the low energy kink exhibits a non-monotonicdoping dependence with its coupling strength enhanced sharply below Tc. Thesesystematic investigations on the doping and temperature dependence of these twoenergy scales favor electron-phonon interactions as their origin. They point tothe importance in involving the electron-phonon coupling in understanding thephysical properties and the superconductivity mechanism of high temperaturecuprate superconductors.

Doping Evolution of Nodal Band Renormalization in Bi2Sr2CuO6+d Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy