Diffusive Limit of a MEP Hydrodynamical Model Obtained from the Bloch-Boltzmann-Peierls Equations for Semiconductors
We consider a MEP hydrodynamical model obtained from a set of transport equations for the distribution functions of electrons in conduction band and phonon. We assume that the MEP model contains equations for the electron density fluxes and energy fluxes, and for the phonons energy fluxes. For this system we introduce a small parameter, related to the transition probabilities in the collision terms, and a diffusive scaling at the level of the Lagrangian multipliers appearing in the closure relations. In the diffusive limit, as the small parameter tends to zero, we obtain a model that can be physically interpreted in the framework of linear irreversible thermodynamics.
KeywordsSmall Parameter Diffusive Limit Moment Equation Macroscopic Model Collision Term
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