We determine the quantum scattering time τq in six graphene samples with mobility of 4 400<μ<17 000 cm²/V s over a wide range of carrier density (1.2<n<6×10¹²/cm²). τq derived from Shubnikov--de Haas oscillation ranges ~25--74 fs, corresponding to a single-particle level broadening of 4.5--13 meV. The ratio of the transport to quantum scattering time τₜ/τq spans 1.5--5.1 in these samples, which can be quantitatively understood combining scattering from short-ranged centers and charged impurities located within 2 nm of the graphene sheet. Our results suggest that charges residing on the SiO₂ surface play a dominant role in limiting carrier mobility in current samples.
No takes yet. Share an insight, caveat, or question.
Hong et al. (2009) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: