  We study inhomogeneous solutions of a 3+1-dimensional Einstein-Maxwell-scalar
theory. Our results provide a holographic model of superconductivity in the
presence of a charge density wave sourced by a modulated chemical potential. We
find that below a critical temperature superconducting stripes develop. We show
that they are thermodynamically favored over the normal state by computing the
grand canonical potential. We investigate the dependence of the critical
temperature on the modulation's wave vector, which characterizes the
inhomogeneity. We find that it is qualitatively similar to that expected for a
weakly coupled BCS theory, but we point out a quantitative difference. Finally,
we use our solutions to compute the conductivity along the direction of the
stripes.
