  We show that when an external magnetic field parallel to the boundary is
applied, the Weyl anomaly gives rises to a new anomalous current in the
vicinity of the boundary. The induced current is a magnetization current in
origin: the movement of the virtual charges near the boundary give rise to a
nonuniform magnetization of the vacuum and hence a magnetization current.
Unlike other previously studied anomalous current phenomena such as the chiral
magnetic effect or the chiral vortical effect, this induced current does not
rely on the presence of a material system and can occur in vacuum. Similar to
the Casimir effect, our discovered phenomenon arises from the effect of the
boundary on the quantum fluctuations of the vacuum. However this induced
current is purely quantum mechanical and has no classical limit. We briefly
comment on how this induced current may be observed experimentally.
