Abstract
We present quantum-mechanical model calculations of nonlinear transport in narrow ballistic constrictions. We calculate the current and differential conductance g as functions of the applied voltage ${V}_{0}$ and the electron Fermi energy ${E}_{F}$. Nonlinear effects in g smooth out transmission resonances and shift and degrade the quantized ballistic conductance plateaus. Contrary to previous claims, we find that g does not develop additional plateaus between those quantized at 2${\mathrm{ne}}^{2}$/h. At high ${V}_{0}$ the current saturates at values strongly dependent on ${E}_{F}$. .AE
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