Full counting statistics of transport through two-channel Coulomb blockade systems

TL;DR

This paper investigates the full counting statistics of electron transport in a two-channel Coulomb blockade system, revealing how shot noise and skewness can distinguish quantum interference effects from classical behavior.

Contribution

It introduces the use of full counting statistics to analyze quantum interference in two-channel Coulomb blockade systems, highlighting the role of shot noise and skewness as sensitive indicators.

Findings

Super-Poisson shot noise due to constructive interference

Dephasing causes transition from quantum to classical transport

Shot noise and skewness are more sensitive to quantum interference

Abstract

A mesoscopic Coulomb blockade system with two identical transport channels is studied in terms of full counting statistics. It is found that the average current cannot distinguish the quantum constructive interference from the classical non-interference, but the shot noise and skewness are more sensitive to the nature of quantum mechanical interference and can fulfill that task. The interesting super-Poisson shot noise is found and is demonstrated as a consequence of constructive interference, which induces an effective system with fast-and-slow transport channels. Dephasing effects on the counting statistics are carried out to display the continuous transition from quantum interfering to non-interfering transports.