  We present direct measurements of the current-phase relation for lateral
Josephson junctions with a graphene barrier, obtained by a phase-sensitive
SQUID interferometry technique. We find that the current-phase relation is
forward skewed with respect to the commonly observed sinusoidal behavior for
short junctions in the quasi-ballistic transport regime, consistent with
predictions for the behavior of Dirac fermions in a Josephson junction. The
skewness increases with critical current and decreases sharply with increasing
temperature.
