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Journal Article

Dynamic screening of quasiparticles in WS2 monolayers

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Calati,  Stefano
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Stähler,  Julia
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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PhysRevB.107.115404.pdf
(Publisher version), 461KB

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Citation

Calati, S., Li, Q., Zhu, X., & Stähler, J. (2023). Dynamic screening of quasiparticles in WS2 monolayers. Physical Review B, 107(11): 115404. doi:10.1103/PhysRevB.107.115404.


Cite as: https://hdl.handle.net/21.11116/0000-000C-D57D-8
Abstract
We unravel the influence of quasiparticle screening in the nonequilibrium exciton dynamics of monolayer WS2. We report pump photon energy-dependent exciton blue- and redshifts from time-resolved-reflectance contrast measurements. Based on a phenomenological model, we isolate the effective impact of excitons and free carriers on the renormalization of the quasifree particle band gap, exciton binding energy, and linewidth broadening. By this, our work not only provides a comprehensive picture of the competing phenomena governing the exciton dynamics in WS2 upon photoexcitation, but also demonstrates that exciton and carrier contributions to dynamic screening of the Coulomb interaction differ significantly.