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

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

2009-09-08

arxiv.org/abs/0909.1595v2

Phys. Rev. B 80, 241415 (Rapid Communications) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures. Supplementary Information: arXiv:0909.2015. Minor changes addressing referees' comments

Scientific paper

10.1103/PhysRevB.80.241415

We determine the quantum scattering time tau_q in six graphene samples with mobility 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 oscillations 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 tau_t/tau_q 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 SiO_2 surface play a dominant role in limiting carrier mobility in current samples.

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