Diffusion-free charge relaxation in a conducting medium

@article{Torrens1976DiffusionfreeCR,
  title={Diffusion-free charge relaxation in a conducting medium},
  author={A. B. Torrens and H W Mott and W. D. Raburn and W J Webb and S. Richter},
  journal={Proceedings of the IEEE},
  year={1976},
  volume={64},
  pages={276-280}
}
The commonly used two-term relaxation equation can lead to inconsistencies, which researchers have sought to resolve by introducing diffusion and scattering-time effects. It is shown here that the complete equation ∂n<sup>~</sup>/∂t + σ/ε n<sup>~</sup>+ E<sup>→</sup>ċ grad<sup>→</sup>(nµ) = 0 is sufficient to account for charge flow, propagation effects and surface-charge induction, as well as instabilities in negative-differential-conductivity materials. 

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