Processing techniques, structural configurations, and electric field influence in Pyramidal Quantum Dots: an experimental and simulative investigation
Loading...
Files
Full Text E-thesis
Date
2025
Authors
Colavecchi, Luca
Journal Title
Journal ISSN
Volume Title
Publisher
University College Cork
Published Version
Abstract
Quantum computing promises to revolutionize information processing by leveraging quantum superposition and entanglement to perform calculations unattainable by classical computers. Among the various solid-state platforms employed in the quest for its practical realization, Quantum Dots (QDs) stand out as scalable and optically addressable artificial atoms, ideal for single-/entangled- photon sources and spin based qubits. However, several challenges arising from the intrinsic properties of QDs still need to be addressed: the earlier development of optoelectronic technologies established key standards in terms of wavelength. As a result, QDs must be engineered to integrate seamlessly with existing platforms, one approach being precise emission wavelength tuning; external tuning is also a strategy to address the Fine Structure Splitting (FSS) of the exciton level, whose reduction is crucial to increase the degree of entanglement; efficient light-matter interaction is pivotal to harness their full potential, requiring engineered photonic environments that enhance emission properties and enable weak and strong coupling regimes.
In my thesis I have studied site-controlled Pyramidal Quantum Dots (PQDs) grown via MOVPE inside tetrahedral recesses defined on <111>B oriented GaAs substrates. This work puts emphasis on the post-growth processing that we generally perform to increase brightness, highlighting the huge impact that simple techniques like bonding, grinding and etching can have on the outcome in terms of specimen yield and photoluminescence.
Description
Keywords
Quantum dots , Semiconductor processing and fabrication
Citation
Colavecchi, L. 2025. Processing techniques, structural configurations, and electric field influence in Pyramidal Quantum Dots: an experimental and simulative investigation. PhD Thesis, University College Cork.