Large and uniform optical emission shifts in quantum dots externally strained along their growth axis

Abstract

We introduce a method which enables to directly compare the impact of elastic strain on the optical properties of distinct quantum dots (QDs). Specifically, the QDs are integrated in a cross-section of a semiconductor core wire which is surrounded by an amorphous straining shell. Detailed numerical simulations show that, thanks to the mechanical isotropy of the shell, the strain field in a core section is homogeneous. Furthermore, we use the core material as an in situ strain gauge, yielding reliable values for the emitter energy tuning slope. This calibration technique is applied to self-assembled InAs QDs submitted to incremental tensile strain along their growth axis. In contrast to recent studies conducted on similar QDs stressed perpendicularly to their growth axis, optical spectroscopy reveals 5-10 times larger tuning slopes, with a moderate dispersion. These results highlight the importance of the stress direction to optimise QD response to applied strain, with implications both in static and dynamic regimes. As such, they are in particular relevant for the development of wavelength-tunable single photon sources or hybrid QD opto-mechanical systems.

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Cited by in corpus (9)

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• Resonant driving of a single photon emitter embedded in a mechanical oscillator
• Uniaxial stress flips the natural quantization axis of a quantum dot for integrated quantum photonics
• Strain-gradient mapping of semiconductor quantum dots
• Static strain tuning of quantum dots embedded in a photonic wire
• Solutions to the generalized Eshelby conjecture for anisotropic media: Proofs of the weak version and counter-examples to the high-order and the strong versions
• One-dimensional photonic wire as a single-photon source: Implications of cavity QED to a phonon bath of reduced dimensionality
• Photonic "hourglass" design beyond the standard bulk model of phonon decoherence
• Counter-examples to the high-order version and strong version of the generalized Eshelby conjecture for anisotropic media