$S_\mathcal{D}$ as it does on $S_\mathcal{S}$. The density structure factor exhibits a reduction, indicating a further suppression of the density fluctuations and an increase of the overall effective interaction. The spin structure factor, on the other hand, markedly increases with increasing $g_{12}$, signaling an increase of the spin fluctuations and a reduction of the effective interaction. In fact, once the intracomponent interaction has reached $g_{12}=g$ (red solid line), $S_\mathcal{S}$ becomes a flat line at unity for all three values of $g$. This indicates that the spin fluctuations are in the shot-noise regime and that the effective interactions have vanished (recall the Bijl-Feynman formula), as we already saw in Fig. \[Fig:DynSF\](c) for $g_{12}=g$. Note that the dip to zero at small momentum is due to the finite size of the system. For $g=\{8,4\}$, a remarkable thing happens since we can have $g_{12}/g>1$ while still being in the miscible phase. In this special regime \[see shading in Figs. \[Fig:SFandE\](b1-c1)\] the effective interaction becomes attractive and spin fluctuations cause bunching with respect to the noninteracting limit, as indicated by the large peak of $S_\mathcal{S}$ in Figs. \[Fig:SFandE\] (b2-c2) (solid black lines). This constitutes an important result of the paper.

It is worth noting 