Shot noise in metallic double dot structures with a negative differential conductance

TL;DR

This paper investigates shot noise in metallic double quantum dot structures with negative differential conductance, providing exact solutions and simulations to analyze current fluctuation behaviors.

Contribution

It offers an exact analytical expression for shot noise spectral density and explores noise characteristics across bias voltages in such structures.

Findings

Noise is always sub-Poissonian.

Noise is significantly enhanced in the negative differential conductance regime.

Analytical and simulation methods agree across the studied bias range.

Abstract

The shot noise of current through a metallic double quantum dot structure exhibiting negative differential conductance is studied. We can exactly solve the master equation and derive an analytical expression of the spectral density of current fluctuations as a function of frequency in the first Coulomb staircase region. For a large range of bias voltage the noise is calculated by Monte Carlo simulation. We show that the noise is always sub-Poissonian though it is considerably enhanced in the negative differential conductance regime.