2.5 Scattering Mechanisms

In an ideal periodic lattice an electron is not scattered at all. Within the approximation of independent electrons scattering occurs only due to deviations from the ideal periodicity. These deviations can be caused by various reasons, such as impurities, crystal defects, and thermal ion vibrations or phonons. Another type of scattering is due to electron-electron interactions. In this case there is a many body problem which is treated by the second quantization formalism introducing additional quasi-particles and considering scattering of electrons on these quasi-particles^2.26. Both types of scattering are used in this work and thus briefly described below.
S. Smirnov: