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

Abstract

Early experiments on alkali-doped graphene demonstrated that the dopant adatoms modify the conductivity of graphene significantly, as extra carriers enhance conductivity while Coulomb scattering off the adatoms suppresses it. However, conductivity probes the overall scattering rate, so a dominant channel associated with long-range Coulomb scattering will mask weaker short-range channels. We present weak localization measurements of epitaxial graphene with lithium adatoms that separately quantify intra- and intervalley scattering rates, then compare the measurements to tight-binding calculations of expected rates for this system. The intravalley rate is strongly enhanced by Li deposition, consistent with Coulomb scattering off the Li adatoms. A simultaneous enhancement of intervalley scattering is partially explained by extra carriers in the graphene interacting with residual disorder. But differences between measured and calculated rates at high Li coverage may indicate adatom-induced modifications to the band structure that go beyond the applied model. Similar adatom-induced modifications of the graphene bands have recently been observed in ARPES, but a full theoretical understanding of these effects is still in development.

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Cited by in corpus (5)

• Atomistic $T$-matrix theory of disordered 2D materials: Bound states, spectral properties, quasiparticle scattering, and transport
• Characterization and manipulation of intervalley scattering induced by an individual monovacancy in graphene
• Signatures of adatom effects in the quasiparticle spectrum of Li-doped graphene
• Mass inversion at the Lifshitz transition in monolayer graphene by diffusive, high-density, on-chip, doping
• Kernel polynomial method to Anderson transition in disordered $\beta$-graphyne