Shot Noise in Tunneling through a Quantum Dot Array

TL;DR

This paper investigates shot noise suppression in a quantum dot array, combining experimental measurements and theoretical modeling to understand non-monotonic Fano factor behavior related to tunneling through quantum dot states.

Contribution

It provides a combined experimental and theoretical analysis of shot noise in quantum dot arrays, highlighting non-monotonic Fano factor dependence on bias voltage.

Findings

Non-monotonic Fano factor dependence observed

Master equation model reproduces behavior qualitatively

Shot noise suppression linked to quantum dot states

Abstract

The shot noise suppression in a sample containing a layer of self-assembled InAs quantum dots has been investigated experimentally and theoretically. The observation of a non-monotonic dependence of the Fano factor on the bias voltage in a regime where only few quantum dot ground states contribute to the tunneling current is analyzed by a master equation model. Under the assumption of tunneling through states without Coulomb interaction this behaviour can be qualitatively reproduced by an analytical expression.