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We report on the observation of a terahertz radiation induced photon drageffect in epitaxially grown $n$- and $p$-type(Bi$_{1-x}$Sb$_{x}$)$_{2}$Te$_{3}$ three dimensional topological insulatorswith different antimony concentrations $x$ varying from 0 to 1. We demonstratethat the excitation with polarized terahertz radiation results in a $dc$electric photocurrent. While at normal incidence a current arises due to thephotogalvanic effect in the surface states, at oblique incidence it isoutweighed by the trigonal photon drag effect. The developed microscopic modeland theory show that the photon drag photocurrent is due to the dynamicalmomentum alignment by time and space dependent radiation electric field andimplies the radiation induced asymmetric scattering in the electron momentumspace.

Photon Drag Effect in (Bi$_{1-x}$Sb$_{x}$)$_{2}$Te$_{3}$ Three Dimensional Topological Insulators