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Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides

M. Selig ; G. Berghäuser ; A. Raja ; P. Nagler ; C. Schüller ; T.F. Heinz ; T. Korn ; A. Chernikov ; Ermin Malic (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; A. Knorr
Proceedings of SPIE - The International Society for Optical Engineering (0277-786X). Vol. 10102 (2017), p. Article no UNSP 101021F .
[Konferensbidrag, refereegranskat]

Monolayers of transition metal dichalcogenides are direct gap semiconductors, which have attracted much attention in the recent past. Due to a strong Coulomb interaction, they possess strongly bound electron-hole pairs, with binding energies of hundreds of meV which is an order of magnitude larger than in conventional materials. Here, we investigate the microscopic origin of the homogeneous linewidth and coherence lifetime of excitonic resonances in monolayer molybdenum disulfide, taking exciton phonon scattering and radiative recombination into account. We find a superlinear increasing homogeneous linewidth from 2 meV at 5K to 14 meV at room temperature corresponding to a coherence lifetime of 160 fs and 25 fs.

Denna post skapades 2017-07-05. Senast ändrad 2017-09-07.
CPL Pubid: 250484


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Institutioner (Chalmers)

Institutionen för fysik, Kondenserade materiens teori (Chalmers)


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Denna publikation är ett resultat av följande projekt:

Graphene-Based Revolutions in ICT And Beyond (GRAPHENE) (EC/FP7/604391)