Browsing by Author "Mera,Hector"
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Item Exciton ionization in multilayer transition-metal dichalcogenides(IOP Publishing Ltd, 7/25/16) Pedersen,Thomas Garm; Latini,Simone; Thygesen,Kristian S.; Mera,Hector; Nikolic,Branislav K.; Thomas Garm Pedersen, Simone Latini, Kristian S Thygesen, Hector Mera and Branislav K Nikolic; Mera Couto, Hector; Nikolic, BranislavPhotodetectors and solar cells based on materials with strongly bound excitons rely crucially on field-assisted exciton ionization. We study the ionization process in multilayer transition-metal dichalcogenides (TMDs) within the Mott-Wannier model incorporating fully the pronounced anisotropy of these materials. Using complex scaling, we show that the field-dependence of the ionization process is strongly dependent on orientation. Also, we find that direct and indirect excitons behave qualitatively differently as a result of opposite effective anisotropy of these states. Based on first-principles material parameters, an analysis of several important TMDs reveals WSe2 and MoSe2 to be superior for applications relying on ionization of direct and indirect excitons, respectively.