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Title: Spectroscopy and accurate spatial positioning of quantum emitters hosted by two-dimensional semiconductors
Author: Branny, Artur
ISNI:       0000 0004 7963 5454
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2018
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Atomically-thin semiconductors offer intriguing technological advantages for quantum photonic applications. Advantages include a lack of dangling bonds, atomically-precise interfaces, the potential to design novel heterostructures with an absence of nuclear spins, and the ease of integration with photonic integrated chip platforms. These benefits offer a new opportunity to construct a scalable quantum architecture with a coherent lightmatter interface, an exciting prospect for future quantum technologies. This thesis takes the first steps in this direction. Atomically-thin flakes of transition metal dichalcogenides (WSe2 or MoSe2) are transferred to substrates with smooth and nanopatterned regions. Using cryogenic microphotoluminesce spectroscopy, a correlation between isolated quantum emitters and localised strain 'pockets' is observed. This observation is exploited to fabricate WSe2 arrays of highly pure single photon (g(2)(0) < 0.5%) emitters at deterministic spatial positions (120±30 nm accuracy) with nearly 100% efficiency. The quantum emitters intrinsic optical properties are characterised via magnetic field and temperature dependent spectroscopy. The nanoscale strain engineering approach provides a universal scheme to create spatially and spectrally isolated quantum emitters in other two-dimensional materials. The thesis concludes with a discussion on the origin and dynamics of strain-tuned localized excitons in 2D semiconductors, presenting local disorder and exciton funnelling as important ingredients.
Supervisor: Gerardot, Brian D. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: two-dimensional semiconductors ; spectroscopy ; photoluminescence ; single quantum emitter ; quantum dots ; nanoscale local strain engineering ; site-control