PhD Candidate
NIKOLAOS CHATZARAKIS
nchatz@materials.uoc.gr
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Title
Single-Photon and Entangled-Photon Nanophotonic Sources Based on Innovative Semiconductor-Nanostructures
Supervisor
PELEKANOS NIKOLAOS, Professor, Materials Science & Technology Dept. - UOC
Committee Members
KOPIDAKIS GEORGIOS, Associate Professor, Materials Science & Technology Dept. - UOC
CHATZOPOULOS ZACHARIAS, Associate Professor, Physics Dept. - UOC
Abstract
Emerging Applications of Quantum Informatics and Quantum Computers demand reliable Single-Photon and Entangled-Photon Pair Sources. The current Ph.D. work aims at bringing out innovative Single-Photon and Entangled-Photon Sources based on Piezoelectric Quantum Dots (QDs) capable of functioning at High Temperatures and of exhibiting Entanglement Phenomena without any External Electric Field assistance. Such QDs will be grown either by Stranski-Krastanov Epitaxy on (211)B GaAs Substrates or within GaAs Nanowires along the (111)B Direction. The work will be based on pre-existing know-how accumulated at the Hosting Institute during recent years, starting from QDs Epitaxy and arriving at Fabrication and Characterization of the complete Nanophotonic Device. In particular, it has been demonstrated that Piezoelectric InAs QDs can operate as Single-Photon Sources at 150 K, and exhibit both distinctly low Fine-Structure Splitting of the excitonic lines and strongly enhanced Stark Effect. We aspire to have accomplished the following noteworthy Results by the end of the Ph.D. Research: 1. Single-Photon Sources composed of InAs or GaAs QDs and capable of operating at Temperatures greater than or equal to 220K, which could be supported by means of a Thermoelectric Cooler. 2. Entangled-Photon Emission being achieved by InAs or GaAs QDs without External Electric Field assistance.