BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Talat Rahman\, University of Central Florida\n\n
\n Single-la yer of molybdenum disulfide (MoS2) and other transition metal d ichalcogenides appear to be promising materials for next generation nanosc ale applications (optoelectronic and catalysis)\, because of their low-dim ensionality\, intrinsic direct band-gap which typically lies in the visibl e spectrum\, and strikingly large binding energies for excitons and trions . Several experimental groups have already reported novel electronic and t ransport properties which place these material beyond graphene for device applications. MoS2 is also known to be a leading hydrodesulphur ization catalyst. Efforts are underway to further tune these properties th rough alloying\, defects\, doping\, coupling to a substrate\, and formatio n of bilayer stacks (homo- and hetero-structures). \; In this talk I w ill present results [1-3] which provide a framework for manipulating the f unctionality of these fascinating materials and take us closer to the goal of rational material design. \; My emphasis will be on properties of pure and defect-laden single layer MoS2 with and without underl ying support. \; I will also provide rationale for the differences in the excitation energetics and ultrafast charge dynamics in single and bila yer (hetero and homo) dichalcogenides.
\n\n [1] D. Sun\, et al.\, &l dquo\;An MoSx Structure with High Affinity for Adsorbate Interaction\,&rdq uo\; Angew. Chem. Int. Ed. 51\, 10284 (2012).
\n\n [2] D. Le\, T. B. Rawal\, and T. S. Rahman\, &ldquo\;Single-Layer MoS2 with Sulf ur-Vacancies: Structure and Catalytic Application\,&rdquo\; J. Phys. Chem. C 118\, 5346 (2014).
\n\n [3] A. Ramirez-Torres\, V.Turkowski\, and T. S. Rahman\, &ldquo\;Time-dependent density-matrix functional theory fo r trion excitations: application to monolayer MoS2\,&rdquo\; Phys. Rev. B 90\, 085419 (2014).
\n DTSTART:20160212T203000Z LOCATION:Physics Building\, Room 204 SUMMARY:Tailoring properties of single and bilayer layer transition metal d ichalcogenides: looking beyond graphene* END:VEVENT END:VCALENDAR