Real-time counting of single electron tunneling through a T-shaped double quantum dot system

TL;DR

This paper simulates real-time single electron tunneling in a T-shaped double quantum dot system, revealing noise characteristics and dephasing mechanisms using Monte Carlo methods.

Contribution

It introduces a Monte Carlo simulation approach to analyze electron tunneling and noise in a double quantum dot system with detailed comparison of dephasing effects.

Findings

Demonstrates electron bunching and super-Poissonian noise.

Identifies differences in dephasing mechanisms from quantum point contact detection and phonon bath.

Reveals noise features linked to various transport mechanisms.

Abstract

Real-time detection of single electron tunneling through a T-shaped double quantum dot is simulated, based on a Monte Carlo scheme. The double dot is embedded in a dissipative environment and the presence of electrons on the double dot is detected with a nearby quantum point contact. We demonstrate directly the bunching behavior in electron transport, which leads eventually to a super-Poissonian noise. Particularly, in the context of full counting statistics, we investigate the essential difference between the dephasing mechanisms induced by the quantum point contact detection and the coupling to the external phonon bath. A number of intriguing noise features associated with various transport mechanisms are revealed.