THE NATURE OF THE ELECTRON IMPACT IONIZATION ENHANCEMENT IN A MULTIQUANTUM WELL STRUCTURE : A NUMERICAL AND ANALYTICAL APPROACH

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Abstract
We present both numerical and analytical calculations verifying the electron impact ionization enhancement in multiquantum well structures. Owing to the inherent nonlinearity of the impact ionization process and the existence of a threshold energy, the electron ionization rate is always enhanced within the narrow gap layer over its corresponding bulk rate. Depending upon the extent of the enhancement, the applied field strength, and the dev ice geometry, the net superlattice ionization rate can be greater than the weighted average of the constituent bulk rates

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