  Armchair silicene nanoribbons with width of 9-39 silicon atoms are
investigated by using self-consistent field crystal orbital method based on
density functional theory. The carrier mobilities obtained from deformation
potential theory oscillate with respect to the width and the values are a
fraction of what the graphene nanoribbons have. The buckled structure, hydrogen
saturation, edge reconstruction as well as edge roughness decrease the carrier
mobilities which are explained with the aid of crystal orbitals.
