band. We therefore did not see it in our experiments. Future measurements with better resolution might reveal this additional feature.The imaginary part of the total charge susceptibility calculated by RPA is plotted against frequency in Extended Data Fig.. The linearly dispersing demon is the most prominent feature at these momenta. Its peak intensity scales approximately as, the demon clearly fails to satisfy any partial, a second mode is visible as well at lower energies ).
$${\chi }_{ab,cd}=-\frac{1}{N}{\int }_{0}^{\beta }{\rm{d}}\tau {{\rm{e}}}^{{\rm{i}}{\omega }_{n}\tau }{\rho }_{cd}\rangle -\langle {\rho }_{ab}{\rho }_{cd}\rangle ).$$$$\begin{array}{l}{\chi }_{ab,cd}^{0}={\delta }_{ad}{\delta }_{bc}\frac{2}{N}\sum _{ij,k}{U}_{ia}{U}_{ja}^{* }{U}_{jb}{U}_{ib}^{* }\\ \,\,\frac{f)-f)}{\omega +{\varepsilon }_{b}-{\varepsilon }_{a}+i{0}^{+}}.\end{array}$$
\The nine non-zero elements of
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