  We investigate the current-induced spin-orbit torque in antiferromangnetic
materials in the presence of Rashba spin orbit coupling using both the linear
response theory and the non-equilibrium Green's function technique implemented
on a tight-binding model. We show that a staggered spin density arises from
interband contributions. The effect of the disorder is restricted to the
diminution of the torque magnitude and does not bring any anomalous behavior to
the dependences of the torque on the spin orbit strength and the exchange
interaction between the antiferromagnetic local moments and the itinerant
electrons spins. We prove that the spin orbit torque is robust against the
application of the disorder compared to the case of the antiferromagnetic
spin-valve spin transfer torque.
