  We present a novel mechanism for the outward transport of crystalline dust
particles: the outward radial drift of pebbles. The dust ring structure is
frequently observed in protoplanetary disks. One of the plausible mechanisms of
the formation of dust rings is the accumulation of pebbles around the pressure
maximum, which is formed by the mass loss due to magnetically driven disk
winds. In evolving protoplanetary disks due to magnetically driven disk winds,
dust particles can migrate outwardly from the crystallization front to the
pressure maximum by radial drift. We found that the outward radial drift
process can transport crystalline dust particles efficiently when the radial
drift timescale is shorter than the advection timescale. Our model predicts
that the crystallinity of silicate dust particles could be as high as 100%
inside the dust ring position.
