Uniaxial stress flips the natural quantization axis of a quantum dot for integrated quantum photonics

Xueyong Yuan, Fritz Weyhausen-Brinkmann, Javier Martín-Sánchez, Giovanni Piredda, Vlastimil Křápek, Yongheng Huo, Huiying Huang, Christian Schimpf, Oliver G. Schmidt, Johannes Edlinger, Gabriel Bester, Rinaldo Trotta and Armando Rastelli ()
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Xueyong Yuan: Johannes Kepler University Linz
Fritz Weyhausen-Brinkmann: Universität Hamburg
Javier Martín-Sánchez: Johannes Kepler University Linz
Giovanni Piredda: FH Vorarlberg
Vlastimil Křápek: Brno University of Technology
Yongheng Huo: Johannes Kepler University Linz
Huiying Huang: Johannes Kepler University Linz
Christian Schimpf: Johannes Kepler University Linz
Oliver G. Schmidt: IFW Dresden
Johannes Edlinger: FH Vorarlberg
Gabriel Bester: Universität Hamburg
Rinaldo Trotta: Johannes Kepler University Linz
Armando Rastelli: Johannes Kepler University Linz

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-05499-5

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