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Enhancement of Exciton–Phonon Scattering from Monolayer to Bilayer WS2

Raja, Archana ; Selig, Malte ; Berghäuser, Gunnar ; Yu, Jaeeun ; Hill, Heather M. ; Rigosi, Albert F. ; Brus, Louis E. ; Knorr, Andreas ; Heinz, Tony F. ; Malic, Ermin ; Chernikov, Alexey


Layered transition metal dichalcogenides exhibit the emergence of a direct bandgap at the monolayer limit along with pronounced excitonic effects. In these materials, interaction with phonons is the dominant mechanism that limits the exciton coherence lifetime. Exciton-phonon interaction also facilitates energy and momentum relaxation, and influences exciton diffusion under most experimental ...


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