Trions and Biexcitons in Two-Dimensional Semiconductors

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• Dr Neil Drummond, Lancaster University
• Thursday 28 May 2015, 14:15-15:15
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Gareth Conduit.

Two-dimensional semiconductors such as transition metal dichalcogenides exhibit unusually strong excitonic effects due to the reduced screening of the Coulomb interaction between charge carriers at long range. Photoexcitation experiments reveal a rich structure in the absorption spectra of these materials, including lines ascribed to various complexes of charge carriers and donor/acceptor ions. I will describe diffusion quantum Monte Carlo calculations of the binding energies of such complexes and I will discuss the implications of the results for the optoelectronic properties of molybdenum and tungsten dichalcogenides.

This talk is part of the Theory of Condensed Matter series.

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