Wide-range <i>T</i> ² resistivity and Umklapp scattering in moire graphene

We argue that the unusually strong electron-electron interactions in narrow bands moir\'e superlattices originate from well-localized Wannier orbitals. Enhanced overlaps of electronic wavefunctions, enabled by such orbitals, result a el-el superlattice umklapp scattering. identify scattering processes as source temperature-dependent resistivity observed these systems. In simple model, predicts $T$-dependent grows $T^2$ and is getting bigger orbital radius decreases. quantify enhancement Kadowaki-Woods (KW) ratio, quantity sensitive to but, helpfully, insensitive effects due high density states. Our analysis anomalously large KW ratio values clearly indicate importance their impact on resistivity.