G. Ali et al., Global existence and relaxation limit for smooth solutions to the Euler-Poisson model for semiconductors, SIAM J MATH, 32(3), 2000, pp. 572-587
We establish the global existence of smooth solutions of the Cauchy problem
for the one-dimensional Euler Poisson model for semiconductors, under the
assumption that the initial data are perturbations of a stationary solution
of the drift-diffusion equations. The resulting evolutionary solutions con
verge asymptotically in time to the unperturbed state.