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VOLUME 57 (1993) | ISSUE 6 | PAGE 346
Short-range impurity in a non-central cross-section of a saddle-point microconstriction
We calculate the conductance of a saddle point potential with a short-range impurity in a non-central cross-section of the channel for arbitrary number of the transverse modes. It is found that one observes series of downward dips in the conductance vs Fermy energy below each threshold as well as the crossover from resonant dip to peak around the threshold.