Full counting statistics of renormalized dynamics in open quantum transport system

TL;DR

This paper investigates how different environmental couplings affect the internal dynamics of a double quantum dot system, revealing unique signatures in full counting statistics such as shot noise and skewness.

Contribution

It distinguishes the effects of electrode and heat bath couplings on renormalization, uncovering their distinct impacts on transport statistics in quantum dots.

Findings

Electrode coupling causes level detuning renormalization, leading to super-Poissonian shot noise.

Heat bath coupling results in interdot coupling renormalization, affecting Fano factor and skewness.

Transport mechanisms are revealed through full counting statistics, not average current.

Abstract

The internal dynamics of a double quantum dot system is renormalized due to coupling respectively with transport electrodes and a dissipative heat bath. Their essential differences are identified unambiguously in the context of full counting statistics. The electrode coupling caused level detuning renormalization gives rise to a fast-to-slow transport mechanism, which is not resolved at all in the average current, but revealed uniquely by pronounced super-Poissonian shot noise and skewness. The heat bath coupling introduces an interdot coupling renormalization, which results in asymmetric Fano factor and an intriguing change of line shape in the skewness.