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Thursday 28 May 2015, 14:15-15:15
Trions and Biexcitons in Two-Dimensional Semiconductors
- đ¤ Speaker: Dr Neil Drummond, Lancaster University đ Website
- đ Date & Time: Thursday 28 May 2015, 14:15 - 15:15
- đ Venue: TCM Seminar Room, Cavendish Laboratory
Abstract
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.
Series This talk is part of the Theory of Condensed Matter series.
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