Static strain tuning of quantum dots embedded in a photonic wire

TL;DR

This paper demonstrates static strain tuning of individual InAs quantum dots in a photonic wire, achieving large energy shifts and resonance between dots, enabling collective quantum effects observation.

Contribution

It introduces a method to tune quantum dot energies using strain in a photonic wire, allowing for resonance control and potential superradiance studies.

Findings

Quantum dots' excitonic transition shifted by over 20 meV.

Resonance achieved between two quantum dots in the wire.

Potential to observe superradiance and collective effects.

Abstract

We use strain to statically tune the semiconductor band gap of individual InAs quantum dots (QDs) embedded in a GaAs photonic wire featuring very efficient single photon collection efficiency. Thanks to the geometry of the structure, we are able to shift the QD excitonic transition by more than 20 meV by using nano-manipulators to apply the stress. Moreover, owing to the strong transverse strain gradient generated in the structure, we can relatively tune two QDs located in the wire waveguide and bring them in resonance, opening the way to the observation of collective effects such as superradiance.