Enhanced Shot Noise in Tunneling through a Stack of Coupled Quantum Dots

TL;DR

This paper investigates shot noise in tunneling through coupled quantum dots, revealing super-Poissonian noise at low temperatures due to capacitive coupling, which diminishes as temperature increases.

Contribution

It demonstrates the temperature-dependent behavior of shot noise in coupled quantum dots and attributes super-Poissonian noise to capacitive interactions.

Findings

Super-Poissonian shot noise observed at low temperatures

Super-Poissonian noise suppressed at higher temperatures

Capacitive coupling explains noise behavior

Abstract

We have investigated the noise properties of the tunneling current through vertically coupled self-assembled InAs quantum dots. We observe super-Poissonian shot noise at low temperatures. For increased temperature this effect is suppressed. The super-Poissonian noise is explained by capacitive coupling between different stacks of quantum dots.