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Díaz Díaz, Jesús Ildefonso ; Galiano, Gonzalo ; Jungel, Ansgar | Pergamon Elsevier Science Ltd | 1999-06-01The temporal and spatial localization of vacuum sets of the solutions to the drift-diffusion equations for semiconductors is studied in this paper. It is shown that if there are vacuum sets initially then there are vacuum sets for a small time, [...]texto impreso
Díaz Díaz, Jesús Ildefonso ; Galiano, Gonzalo ; Jungel, Ansgar | Pergamon Elsevier Science Ltd. | 2001-09This paper is about the drift-diffusion equations for semiconductors. Existence and uniqueness of weak solutions are obtained. The existence is proved by using the regularization technique. The proof of the uniqueness is interesting.texto impreso
A degenerate parabolic system consisting in two continuity equations for densities of charged particles and in the Poisson equation for an electric potential is considered. We show the finite speed of propagation, a waiting time property for the[...]
