  The emergence of a topological superconducting state in van der Waals
heterostructures provides a new platform for exploring novel strategies to
control topological superconductors. In particular, impurities in van der Waals
heterostructures, generically featuring a moire pattern, can potentially lead
to the unique interplay between atomic and moire length scales, a feature
absent in generic topological superconductors. Here we address the impact of
non-magnetic impurities on a topological moire superconductor, both in the weak
and strong regime, considering both periodic arrays and single impurities in
otherwise pristine infinite moire systems. We demonstrate a fine interplay
between impurity-induced modes and the moire length, leading to radically
different spectral and topological properties depending on the relative
impurity location and moire lengths. Our results highlight the key role of
impurities in van der Waals heterostructures featuring moire patterns,
revealing the key interplay between length and energy scales in artificial
moire systems.
