Selective Optical Charge Generation, Storage and Readout in a Single Self Assembled Quantum Dot

TL;DR

This paper demonstrates a single quantum dot device capable of selective optical charge storage and readout, enabling detailed investigation of electron tunneling and charge dynamics over microsecond timescales.

Contribution

The study introduces a novel quantum dot device with optical charge control and long-term storage, facilitating new insights into charge and spin dynamics at the single-dot level.

Findings

Successful optical charging and readout of a single quantum dot

Charge storage times exceeding microseconds

Electric field dependent electron tunneling dynamics observed

Abstract

We report the investigation of a single quantum dot charge storage device. The device allows selective optical charging of a single dot with electrons, storage of these charges over timescales much longer than microseconds and reliable optical readout of the charge occupancy using a time gated photoluminescence technique. This device enables us to directly investigate the electric field dependent tunneling escape dynamics of electrons at high electric fields over timescales up to 4 us. The results demonstrate that such structures and measurement techniques can be used to investigate charge and spin dynamics in single quantum dots over microsecond timescales.