Abstract
The conductance of a quantum contact containing single point defects and a potential barrier is investigated theoretically. The dependence of the conductance G on the applied voltage U is obtained for the model of a quantum wire connecting massive banks. The comparative values of the different nonlinear contributions to the conductance due to the interference of electron waves scattered by defects and by defects and the barrier are analyzed. The latter contribution becomes dominant even at extremely small coefficients of reflection of electrons from the barrier. It is shown that the dependence of the transmission coefficient T12 on the electron energy E explains the experimentally observed suppression of oscillation of the conductance G(U) when its absolute value is close to the single-quantum value G0=2e2/h.
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