Uniaxial stress flips the natural quantization axis of a quantum dot for integrated quantum photonics
Abstract
The optical selection rules in epitaxial quantum dots are strongly influenced by the orientation of their natural quantization axis, which is usually parallel to the growth direction. This configuration is well suited for vertically emitting devices, but not for planar photonic circuits because of the poorly controlled orientation of the transition dipoles in the growth plane. Here we show that the quantization axis of gallium arsenide dots can be flipped into the growth plane via moderate in plane uniaxial stress. By using piezoelectric strain actuators featuring strain-amplification we study the evolution of the selection rules and excitonic fine-structure in a regime, in which quantum confinement can be regarded as a perturbation compared to strain in determining the symmetry properties of the system. The experimental and computational results suggest that uniaxial stress, may be the right tool to obtain quantum light sources with ideally oriented transition dipoles and enhanced oscillator strengths for integrated quantum photonics.
Keywords
Cite
@article{arxiv.1710.03962,
title = {Uniaxial stress flips the natural quantization axis of a quantum dot for integrated quantum photonics},
author = {Xueyong Yuan and Fritz Weihausen-Brinkmann and Javier Martín-Sánchez and Giovanni Piredda and Vlastimil Křápek and Yongheng Huo and Huiying Huang and Christian Schimpf and Oliver G. Schmidt and Johannes Edlinger and Gabriel Bester and Rinaldo Trotta and Armando Rastelli},
journal= {arXiv preprint arXiv:1710.03962},
year = {2018}
}
Comments
44 pages, 17 figures (including supplementary information)