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Tuning emission of charged excitons in two-dimensional transition metal dichalcogenide monolayers

Project description

Charged excitons pave the way to more efficient quantum technologies

Transition metal dichalcogenide (TMD) monolayers are atomically thin semiconductors that are deemed promising platforms for quantum information technologies as they host ‘valleys’ as quantum degrees of freedom that can serve as qubits. Controlling the polarisation of the light that excitons generate inside these semiconductors could lead to more efficient quantum devices. Funded by the Marie Skłodowska-Curie Actions programme, the 2DCHEX project plans to create an electro-optical interface by doping TMD monolayers. The electric double layers should control charged exciton formation, while complex nanoantennas should enhance collimated beam emission. The ultimate goal is to develop a bright, directional and electrically tuneable quantum device operating at room temperature that could render quantum computing and information technologies more efficient.

Objective

Transition metal dichalcogenide (TMD) monolayers constitute an attractive material platform due to additional degrees of freedom in encoding and processing quantum information. Currently, the use of these degrees of freedom in valleytronics is hampered due to the low valley polarization of the neutral exciton at room temperature. Recently, charged excitons have been demonstrated to exhibit high valley polarization even at room temperature albeit with low quantum yield and have a need for sophisticated charge doping techniques. This action proposes a novel electro-optical interface based on electron doping of TMD monolayers. I suggest to use the electric double layers to control the formation of charged excitons, and to use complex nanoantennas to enhance and collimate generated emission. My goal is to develop a quantum device merging fields of electrochemistry, photonics, plasmonics and TMD materials, giving practical access to new degrees of freedom for future valleytronic applications. The objectives are to demonstrate the exciton charging in TMD monolayers using a custom-built electrochemical cell and to tune electrically charged-exciton emission through the manipulation of the Fermi level, i.e. chemical potential. I aim to use the tuning of emission energy for coupling the charged exciton with a narrow resonance of a complex nanoantenna. This antenna will increase the extraction efficiency by directing the emission of charged excitons and enhancing their generation rate. Furthermore, I aim to explore the chirality of valley polarization and address the emission of charged excitons for their directional coupling with plasmons in high quality wedge waveguides based on crystalline gold micro-flakes. The overarching aim of my action is the development of a novel bright, directional, and electrically tunable quantum emitting device operating at room temperature for future quantum computing and information technologies.

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Coordinator

SYDDANSK UNIVERSITET
Net EU contribution
€ 207 312,00
Address
Campusvej 55
5230 Odense m
Denmark

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Region
Danmark Syddanmark Fyn
Activity type
Higher or Secondary Education Establishments
Links
Other funding
€ 0,00