  We study the low-temperature domain growth kinetics of the two-dimensional
Ising model with long-range coupling: $J(r) \sim r^{-(d+\sigma)}$, where $d=2$
is the dimensionality. According to the Bray-Rutenberg predictions, the
exponent $\sigma$ controls the algebraic growth in time of the characteristic
domain size $L(t)$, $L(t) \sim t^{1/z}$, with growth exponent $z=1+\sigma$ for
$\sigma <1$ and $z=2$ for $\sigma >1$. These results hold for quenches to a
non-zero temperature $T>0$ below the critical temperature $T_c$. We show that,
in the case of quenches to $T=0$, due to the long-range interactions, the
interfaces experience a drift which makes the dynamics of the system peculiar.
More precisely we find that in this case the growth exponent takes the value
$z=4/3$, independent of $\sigma$, showing that it is a universal quantity. We
support our claim by means of extended Monte Carlo simulations and analytical
arguments for simplified models.
