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SUMMARY:Trions and Biexcitons in Two-Dimensional Semiconductors - Dr Neil 
 Drummond\, Lancaster University
DTSTART:20150528T131500Z
DTEND:20150528T141500Z
UID:TALK58280@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Two-dimensional semiconductors such as transition metal dichal
 cogenides exhibit unusually strong excitonic effects due to the reduced sc
 reening of the Coulomb interaction between charge carriers at long range. 
 Photoexcitation experiments reveal a rich structure in the absorption spec
 tra of these materials\, including lines ascribed to various complexes of 
 charge carriers and donor/acceptor ions.  I will describe diffusion quantu
 m Monte Carlo calculations of the binding energies of such complexes and I
  will discuss the implications of the results for the optoelectronic prope
 rties of molybdenum and tungsten dichalcogenides.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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