= Electron-phonon scattering
In <electron-phonon scattering>, an <electron> changes its <energy> by $\pm\hbar\omega_{\mathbf q}$ while its <crystal momentum> changes by a <phonon> <wavevector> modulo a <reciprocal lattice> vector. Charge-transport relaxation weights a <scattering angle> $\theta$ by $1-\cos\theta$. Small-angle events can therefore relax heat efficiently while relaxing electrical current weakly. At <temperatures> above the <phonon> excitation scale, scattering becomes approximately elastic in the <electron> thermal shell; residual elastic disorder often dominates at very low <temperature>.
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