  We studied the non-equilibrium short-time dynamics of a spin-1/2 chain with
Dzyaloshinskii-Moriya interactions after a sudden quench by a transverse field.
We found that inhomogeneous spin-spirals with opposite chiralities propagate
from the edges towards the center of the chain. This propagation is accompanied
by quantum spin oscillations which decay asymptotically with time. A
theoretical description of this phenomenon is given to a good accuracy with the
help of numerical calculations with the adaptive time-dependent density matrix
renormalization group algorithm.
