  We numerically compute current-induced spin-transfer torques for
antiferromagnetic domain walls, based on a linear response theory in a
tight-binding model. We find that, unlike for ferromagnetic domain wall motion,
the contribution of adiabatic spin torque to antiferromagnetic domain wall
motion is negligible, consistent with previous theories. As a result, the
non-adiabatic spin-transfer torque is a main driving torque for
antiferromagnetic domain wall motion. Moreover, the non-adiabatic spin-transfer
torque for narrower antiferromagnetic domain walls increases more rapidly than
that for ferromagnetic domain walls, which is attributed to the enhanced spin
mistracking process for antiferromagnetic domain walls.
