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Early experiments on alkali-doped graphene demonstrated that the dopantadatoms modify the conductivity of graphene significantly, as extra carriersenhance conductivity while Coulomb scattering off the adatoms suppresses it.However, conductivity probes the overall scattering rate, so a dominant channelassociated with long-range Coulomb scattering will mask weaker short-rangechannels. We present weak localization measurements of epitaxial graphene withlithium adatoms that separately quantify intra- and intervalley scatteringrates, then compare the measurements to tight-binding calculations of expectedrates for this system. The intravalley rate is strongly enhanced by Lideposition, consistent with Coulomb scattering off the Li adatoms. Asimultaneous enhancement of intervalley scattering is partially explained byextra carriers in the graphene interacting with residual disorder. Butdifferences between measured and calculated rates at high Li coverage mayindicate adatom-induced modifications to the band structure that go beyond theapplied model. Similar adatom-induced modifications of the graphene bands haverecently been observed in ARPES, but a full theoretical understanding of theseeffects is still in development.

Weak localization measurements of electronic scattering rates in Li-doped epitaxial graphene