Research

FEMTOSECOND Dynamics of 2D MATERIALS

We probe the dynamics of excitons and phonons directly in the time-domain using ultrafast spectroscopy techniques. We study layered materials in bulk and monolayer form, van der Waals heterostructures, and integrated into functional optoelectronic devices. We primarily work on transition metal dichalcogenides (TMDs) which have a range of properties; from semiconductors to superconductors.

Selected Publications:

[1] Nano Letters 23, 9235 (2023)

[2] Advanced Optical Materials 10, 2200362 (2022)

ELECTRONIC STRUCTURE

Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool to directly visualize the electronic structure of 2D materials. We use this technique to investigate the properties of layered semiconductors, charge-density-wave systems and Mott insulators, which we do both steady-state and in the time-domain.

Selected Publications:

[1] 2D Materials 8, 045036 (2021)

[2] Physical Review B 102, 161105(R) (2020)

Charge density wave PHENOMENA

Charge density waves (CDWs) are an ordered state of matter which spontaneously form at low temperatures in strongly correlated materials. We study CDW phenomena in layered transition metal dichalcogenides (TMDs) by investigating their electronic structure using photoemission, optical spectroscopy, and by probing their electron and phonon dynamics in real-time using femtosecond laser pulses.

Selected Publications:

[1] Physical Review Letters 130, 156401 (2023)

[2] Physical Review B 104, 165134 (2021)

[3] Physical Review Research 1, 023029 (2019)

Crystal growth

We prepare high-quality single crystals by chemical vapour transport (CVT), ready for studying the bulk, or as source material for exfoliating thin flakes down to monolayer. Our samples are investigated by optical spectroscopy, photoemission, and electronic transport, in our own laboratories and at international facilities. We have optimized our growth technique to achieve extremely low defect densities which have allowed, for example, the observation of quantum oscillations in TMDs.

Selected Publications:

[1] Physical Review Letters 124, 167602 (2020)

[2] Physical Review Materials 4, 025002 (2020)

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