Independent dynamic acousto-mechanical and electrostatic control of individual quantum dots in a LiNbO$_{3}$-GaAs hybrid

TL;DR

This paper presents a hybrid device that uses surface acoustic waves and electric fields to dynamically tune the emission of individual quantum dots in a controlled and programmable manner.

Contribution

It introduces a novel hybrid LiNbO₃-GaAs device enabling independent electrical control of quantum dot emission via acoustic and static electric fields.

Findings

Achieved dynamic spectral tuning exceeding 3 meV of quantum dots.

Demonstrated independent programming of spectral oscillation center energy.

Combined acoustic and electric control allows precise emission tuning.

Abstract

We demonstrate tuning of single quantum dot emission lines by the combined action of the dynamic acoustic field of a radio frequency surface acoustic wave and a static electric field. Both tuning parameters are set all-electrically in a LiNbO$_{3}$-GaAs hybrid device. The surface acoustic wave is excited directly on the strong piezoelectric LiNbO$_{3}$ onto which a GaAs-based p-i-n photodiode containing a single layer of quantum dots was epitaxially transferred. We demonstrate dynamic spectral tuning with bandwidths exceeding 3 meV of single quantum dot emission lines due to deformation potential coupling. The center energy of the dynamic spectral oscillation can be independently programmed simply by setting the bias voltage applied to the diode.