Excitonics with 2D materials

- TMDC excitonics

Transition metal dichalcogenides present very peculiar optical properties, governed by excitons even above room temperature. Besides, some of them have direct bandgap unlike their bulk counterparts, which makes them attractive for light emission/detection. As any 2D material, they are very sensitive to their environment and to access their intrinsic properties it is often needed to prepare them on well-suited substrates such as boron nitride, or even to encapsulate them. Preparation of such van der Waals heterostructures is one of the know-hows available in the group. Exciton (electron-hole pairs) in these systems present a very large binding energy (several hundreds of meV) due to the effect of dimensionality and the importance of Coulomb interactions. In collaboration with other teams at Institut Néel (Nanophysics and Semiconductors) we use advanced spectroscopy techniques (four-wave mixing for instance) to understand the underlying physics in these new systems, for instance the role of defects, charge transfers, and deformations [1].

 
[1] S. Dubey et al., ACS Nano, 11, 11, 11206-11216 (2017) -> doi.org/10.1021/acsnano.7b05520

 

 

Contact : julien.renard@neel.cnrs.fr ; nedjma.bendiab@neel.cnrs.fr

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