Surface acoustic wave controlled carrier injection into self-assembled quantum dots and quantum posts

TL;DR

This paper demonstrates how surface acoustic waves can precisely control carrier injection into quantum dots and quantum posts, enabling deterministic photon pair generation and advancing quantum photonic technologies.

Contribution

It introduces a novel acousto-electrical control method using SAWs for manipulating carrier dynamics in quantum nanostructures, with high fidelity and remote injection capabilities.

Findings

Controlled exciton dissociation and carrier injection via SAWs.

High-fidelity preparation of neutral biexcitons.

Efficient acoustic charge conveyance and remote carrier injection.

Abstract

We report on recent progress in the acousto-electrical control of self-assembled quantum dot and quantum post using radio frequency surface acoustic waves (SAWs). We show that the occupancy state of these optically active nanostructures can be controlled via the SAW-induced dissociation of photogenerated excitons and the resulting sequential bipolar carrier injection which strongly favors the formation of neutral excitons for quantum posts in contrast to conventional quantum dots. We demonstrate high fidelity preparation of the neutral biexciton which makes this approach suitable for deterministic entangled photon pair generation. The SAW driven acoustic charge conveyance is found to be highly efficient within the wide quantum well surrounding the quantum posts. Finally we present the direct observation of acoustically triggered carrier injection into remotely positioned, individual quantum posts which is required for a low-jitter SAW-triggered single photon source.