Wave instability in semiconductors without negative differential conductivity

Christen, Thomas

doi:10.1103/physrevb.49.16423

Cited by 4 publications

(1 citation statement)

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“…In particular, Zeller [4] assumed an underlying bulk-current instability associated with negative differential conductivity which leads to a sharp mobility edge at a critical field E,. We emphasize that, in general, current instabilities are not necessarily based on an current voltage characteristic with negative differential conductivity; only the undamping of zero frequency and zero wave number bulk modes requires such a (saddlenode) bifurcation point of the dc characteristics [9].…”

Section: Introductionmentioning

confidence: 99%

Charge injection instability

Christen

ICSD'98. Proceedings of the 1998 IEEE 6th International Conference on Conduction and Breakdown in Solid Dielectrics (Cat. No.98

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We show that charge injection at a field-enhancing defect in a dielectric: free of carriers but with a nonlinear carrier mobility corresponds to an instability of the insulating state. The formation of the charged state is governed by two different processes with clearly separated time scales. First, due to a fast growth of a charge-injection mode, a localized charge cloud forms near the injecting defect. Secondly, the charge slowly redistributes in the bulk. In the present paper we discuss the linear instability of the insulating state for cylindrical and spherical geclmetries. The theory explains an experimentally obscrved increase of the critical electric field with decreasing size of the injecting contact. Numerical results ;ue presented for dc and ac biased insulators.

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Section: Introductionmentioning

confidence: 99%