  Optical vortex, a light beam carrying orbital angular momentum (OAM) has been
realized in experiments, and its interactions with magnets show abundant
physical characteristics and great application potentials. In this work, we
propose that optical vortex can control skyrmion ultrafast in antiferromagnets
using numerical and analytical methods. Isolated skyrmion can be
generated/erased in a very short time ~ps by beam focusing. Subsequently, the
OAM is transferred to the skyrmion and results in its rotation motion.
Different from the case of ferromagnets, the rotation direction can be
modulated through tuning the light frequency in antiferromagnets, allowing one
to control the rotation easily. Furthermore, the skyrmion Hall motion driven by
multipolar spin waves excited by optical vortex is revealed numerically,
demonstrating the dependence of the Hall angle on the OAM quantum number. This
work unveils the interesting optical-controlled skyrmion dynamics in
antiferromagnets, which is a crucial step towards the development of optics and
spintronics.
