LA phonons scattering of surface electrons in Bi{sub 2}Se{sub 3}
Within the Boltzmann equation formalism we evaluate the transport relaxation time of Dirac surface states (SSs) in the typical topological insulator(TI) Bi{sub 2}Se{sub 3} due to the phonon scattering. We find that although the back-scattering of the SSs in TIs is strictly forbidden, the in-plane scattering between SSs in 3-dimensional TIs is allowed, maximum around the right-angle scattering. Thus the topological property of the SSs only reduces the scattering rate to its one half approximately. Besides, the larger LA deformation potential and lower sound velocity of Bi{sub 2}Se{sub 3} enhance the scattering rate significantly. Compared with the Dirac electrons in graphene, we find the scattering rate of SSs in Bi{sub 2}Se{sub 3} are two orders of magnitudes larger, which agree with the recent transport experiments.