  Using bosonization, we study a microscopic model of parallel quantum wires
constructed from two dimensional Dirac fermions in the presence of periodic
topological domain walls. The model accounts for the lateral spread of the
wavefunctions $\ell$ in the transverse direction to the wires. The gapless
modes confined to each domain wall are shown to form Luttinger liquids, which
realize a well known smectic non-Fermi liquid fixed point when interwire
Coulomb interactions are taken into account. Perturbative studies on
phenomenological models have shown that the smectic fixed point is unstable
towards a variety of phases such as superconductivity, stripe, smectic and
Fermi liquid phases. Here, we show that the considered microscopic model leads
to a phase diagram with only smectic metal and Fermi liquid phases. The smectic
metal phase is stable in the ideal quantum wire limit $\ell\to0$. For finite
$\ell$, we find a critical Coulomb coupling $\alpha_{c}$ separating the strong
coupling smectic metal from a weak coupling Fermi liquid phase. We conjecture
that the absence of superconductivity should be a generic feature of similar
microscopic models. Finally, we discuss the physical realization of this model
with moire heterostructures.
