### 5.6 Intervalley Scattering

Formally, the intervalley scattering is treated in the same way as the scattering due to
optical phonons with a deformation potential. It has been shown that the phonon assisted
intervalley scattering can be modeled by means of an intervalley deformation potential
[88].

| (5.30) |

where η and η^{′ } denote the initial and the final valley index, respectively. D_{ηη′} is the intervalley
deformation potential constant, ρ is the mass density, E_{ηη′} is the intervalley phonon energy, and Z_{η′}
denotes the degeneracy of the final valley. The overlap integral is determined by

| (5.31) |