Voltage dependent conductance and shot noise in quantum microconstriction with single defects

TL;DR

This paper theoretically investigates how single impurities and barriers affect the nonlinear conductance and shot noise in metallic microconstrictions, revealing nonmonotonic behavior with respect to applied bias.

Contribution

It introduces a theoretical model analyzing the interference effects of electron waves scattered by impurities and barriers on conductance and shot noise.

Findings

Conductance and shot noise exhibit nonmonotonic dependence on bias.

Interference effects significantly influence electronic transport properties.

Single impurities cause measurable variations in shot noise.

Abstract

The influence of the interference of electron waves, which are scattered by single impurities and by a barrier on nonlinear conductance and shot noise of metallic microconstriction is studied theoretically. It is shown that the these characteristics are nonmonotonic functions on the applied bias.