  We study the kinetics of vapor-liquid phase separation in a quasi
one-dimensional confined active matter system using molecular dynamics
simulations. Activity is invoked via the Vicsek rule, while passive interaction
follows the Lennard-Jones potential. With the system density near the vapor
branch, the evolution morphology features disconnected liquid clusters. In the
passive limit, coarsening begins with nucleation, followed by an
evaporation-condensation growth mechanism, leading to a metastable state
without complete phase separation. We aim to understand the impact of
Vicsek-like self-propulsion on the structure and growth of these clusters. Our
key finding is that Vicsek activity results in a distinct growth mechanism,
notably rapid cluster growth and the breakdown of the metastable state through
ballistic aggregation. Relevant growth laws are analyzed and explained using
appropriate theoretical models.
