Real-Time Detection and Control of Correlated Charge Tunneling in a Quantum Dot

TL;DR

This paper reports the real-time detection and control of correlated charge tunneling in a quantum dot, revealing how periodic driving influences electron-hole correlations and matching theoretical models.

Contribution

It introduces a method for real-time measurement and control of correlated tunneling events in quantum dots, advancing understanding of electron transport under dynamic conditions.

Findings

Hole tunneling times are strongly correlated due to drive and Coulomb interactions.

Electron tunneling times are not significantly correlated.

Correlation degree can be tuned by the external drive.

Abstract

We experimentally demonstrate the real-time detection and control of correlated charge tunneling in a dynamically driven quantum dot. Specifically, we measure the joint distribution of waiting times between tunneling charges and show that the waiting times for holes may be strongly correlated due to the periodic drive and the Coulomb interactions on the dot, although the electron waiting times are not. Our measurements are in excellent agreement with a theoretical model that allows us to develop a detailed understanding of the correlated tunneling events. We also demonstrate that the degree of correlations can be controlled by the drive. Our experiment paves the way for systematic real-time investigations of correlated electron transport in low-dimensional nanostructures.