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The zero gap surface states of a 3D-topological insulator host highly mobileDirac fermions with spin locked to the momentum. The high mobility attributedto absence of back scattering is reduced in presence of impurities on thesurface. In particular, we discuss and compare scattering times for localizedimpurities on the surface, scattering between states of opposite helicitylocated on different surfaces coupled through a hybridization potential, andthe role of magnetic impurities. Magnetic impurities give rise to an additionalspin suppression factor. The role of warped bands and its influence ontopological factors that can enhance the overall surface mobility is examined.

Scattering times and mobility with localized impurities in topological insulator films