  Moir\'e patterns with angular mismatch in van der Waals heterostructures
composed of atomically thin semiconducting materials are a fascinating platform
to engineer the optically generated excitonic properties towards novel quantum
phenomena. The moir\'e pattern as a periodic trap potential can give rise to
spatially ordered zero-dimensional (0D) exciton ensembles, which offers the
possibility for dense coherent quantum emitters and quantum simulation of
many-body physics. The intriguing moir\'e exciton properties are affected by
their dynamics and exciton-phonon interaction. However, the moir\'e exciton
dynamics and the interaction between the moir\'e exciton and phonon are still
elusive. Here, we report the moir\'e exciton and phonon interaction in a
twisted WSe$_2$/MoSe$_2$ heterobilayer based on near-resonant photoluminescence
excitation spectroscopy. We observed the selective excitation of the ground
state of the moir\'e exciton at phonon resonance. The otherwise negligible
small absorption below the continuum state is a hallmark of the density of
states of a 0D-like system. In addition, the excitation power dependence of the
PL spectra reveals the dynamics of moir\'e exciton ensembles between different
potential minima with discrete energy levels via the resonant phonon scattering
process. The results presented here of the moir\'e exciton dynamics under
suppressed phonon interaction could pave a new way for the exploration of novel
quantum phenomena of the moir\'e exciton towards potential applications in
quantum optics.
