Math @ Duke

Publications [#244140] of Stephanos Venakides
Papers Published
 Bonilla, LL; Higuera, FJ; Venakides, S, Gunn effect: Instability of the steady state and stability of the solitary wave in long extrinsic semiconductors,
SIAM Journal on Applied Mathematics, vol. 54 no. 6
(1994),
pp. 15211541
(last updated on 2018/08/15)
Abstract: A linear stability analysis of the stationary solution of a onedimensional driftdiffusion model used to describe the Gunn effect in GaAs is performed. It is shown that for long semiconductor samples under dc voltage bias conditions, and small diffusivity, the steady state may lose stability via a Hopf bifurcation. In the limit of infinitely long samples, there is a quasicontinuum of oscillatory modes of the equation linearized about the steady state that a acquire positive real part for voltages larger than a certain critical value. The linear stability of the solitary wave characteristic of the Gunn effect is proved for an idealized electron velocity curve in the zero diffusion limit.


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