Abstract

In this article, the author discuss the experiments performed on atomically-clean graphene on SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in ultra-high vacuum to determine the charge carrier scattering rates from charged impurities, lattice defects, and phonons (graphene acoustic phonons and substrate polar optical phonons), as well as their dependence on dielectric environment. Addition of potassium to graphene as a model charged impurity is used to study the dependence of the mobility and minimum conductivity point on charged impurity density.

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