  Within gauge/gravity duality, we consider finite density systems in a helical
lattice dual to asymptotically anti-de Sitter space-times with Bianchi VII
symmetry. These systems can become an anisotropic insulator in one direction
while retaining metallic behavior in others. To this model, we add a $U(1)$
charged scalar and show that below a critical temperature, it forms a spatially
homogeneous condensate that restores isotropy in a new superconducting ground
state. We determine the phase diagram in terms of the helix parameters and
perform a stability analysis on its IR fixed point corresponding to a finite
density condensed phase at zero temperature. Moreover, by analyzing
fluctuations about the gravity background, we study the optical conductivity.
Due to the lattice, this model provides an example for a holographic
insulator-superfluid transition in which there is no unrealistic delta-function
peak in the normal phase DC conductivity. Our results suggest that in the zero
temperature limit, all degrees of freedom present in the normal phase condense.
This, together with the breaking of translation invariance, has implications
for Homes' and Uemuras's relations. This is of relevance for applications to
real world condensed matter systems. We find a range of parameters in this
system where Homes' relation holds.
