Counting statistics of single-electron transport in a quantum dot

TL;DR

This paper reports on measuring the full counting statistics of electron transport in a quantum dot using real-time detection, revealing suppression of noise moments and enabling low-current noise measurement.

Contribution

It introduces a method for directly measuring the full counting statistics of single-electron transport in quantum dots.

Findings

Demonstrated suppression of shot noise and distribution asymmetry.

Achieved measurement of very low current and noise levels.

Provided direct access to current fluctuation distribution functions.

Abstract

We have measured the full counting statistics (FCS) of current fluctuations in a semiconductor quantum dot (QD) by real-time detection of single electron tunneling with a quantum point contact (QPC). This method gives direct access to the distribution function of current fluctuations. Suppression of the second moment (related to the shot noise) and the third moment (related to the asymmetry of the distribution) in a tunable semiconductor QD is demonstrated experimentally. With this method we demonstrate the ability to measure very low current and noise levels.