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We determine the quantum scattering time tau_q in six graphene samples withmobility of 4,400 < mu < 17,000 cm^2/Vs over a wide range of carrier density(1.2 < n < 6x10^{12}/cm^2). tau_q derived from Shubnikov-de Haas oscillationsranges ~25-74 fs, corresponding to a single-particle level broadening of 4.5-13meV. The ratio of the transport to quantum scattering time tau_t/tau_q spans1.5-5.1 in these samples, which can be quantitatively understood combiningscattering from short-ranged centers and charged impurities located within 2 nmof the graphene sheet. Our results suggest that charges residing on the SiO_2surface play a dominant role in limiting carrier mobility in current samples.

The quantum scattering time and its implications on scattering sources in graphene