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The improved resolution of laser-based angle-resolved photoemissionspectroscopy (ARPES) allows reliable access to fine structures in the spectrum.We present a systematic, doping-dependent study of a recently discoveredlow-energy kink in the nodal dispersion of Bi2Sr2CaCu2O8+d (Bi-2212), whichdemonstrates the ubiquity and robustness of this kink in underdoped Bi-2212.The renormalization of the nodal velocity due to this kink becomes strongerwith underdoping, revealing that the nodal Fermi velocity is non-universal, incontrast to assumed phenomenology. This is used together with laser-ARPESmeasurements of the gap velocity, v2, to resolve discrepancies with thermalconductivity measurements.

Doping-dependent nodal Fermi velocity in Bi-2212 revealed by high-resolution ARPES