Mr. Thomas P. Lyons

Research Interests

My research is focused on optical investigations of direct band gap semiconducting monolayer transition metal dichalcogenides (TMDs), specifically molybdenum and tungsten diselenides. In particular I work on 2-dimensional polaritonics by incorporating these atomically thin materials into open-access tuneable microcavities. Accessing the strong coupling regime in this way allows significant insight into the valley dynamics of exciton-polaritons in monolayer TMDs, and as such can be used to probe exciton valley polarisation and coherence effects. In addition to using microcavities, I study these novel materials by magneto-optical spectroscopy, to investigate magnetic field dependent behaviour of exciton fine structure and valley polarisation.

Besides optical spectroscopy, I work on fabrication of 2-dimensional material samples for my research. This involves mechanical exfoliation and use of various crystal transfer techniques in order to produce samples ranging from single isolated monolayers on a variety of substrates, to van der Waals heterostructures combining TMDs, hexagonal boron nitride and graphene.

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