Abstract
We have developed a model for calculating differential conductance that accounts for the effects observed at high source-drain voltage. The model uses a linear potential drop over a saddle-point potential. If the region of the potential drop is wide enough, only that region is contributing to the transmission and a simple expression is obtained. The temperature is assumed to increase linearly with the source-drain voltage and a model for an equipotential region in the saddle-point potential corresponding to the channel width is made. The result from the calculations of the conductance with this model is in good agreement with experimental results.
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