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Exciton-exciton annihilation in MoSe2 monolayers
Kumar, Nardeep Cui, Qiannan Ceballos, Frank He, Dawei Wang, Yongsheng Zhao, Hui
Kumar, Nardeep
Cui, Qiannan
Ceballos, Frank
He, Dawei
Wang, Yongsheng
Zhao, Hui
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Abstract
We investigate the excitonic dynamics in MoSe2 monolayer and bulk samples by femtosecond transient absorption. Excitons are resonantly injected by a 750-nm and 100-fs laser pulse, and are detected by measuring a differential reflection of a probe pulse tuned in the range 790–820 nm. We observe a strong density-dependent initial decay of the exciton population in monolayers, which can be well described by the exciton-exciton annihilation. Such a feature is not observed in a bulk sample under comparable conditions. We also observe the saturated absorption induced by excitons in both monolayers and the bulk in the differential reflection measurements, which indicates their potential applications as saturable absorbers.
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This is the published version. Copyright ©2014 American Physical Society
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2014-03-24
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American Physical Society
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Kumar, Nardeep, Qiannan Cui, Frank Ceballos, Dawei He, Yongsheng Wang, and Hui Zhao. "Exciton-exciton Annihilation in MoSe 2 Monolayers." Phys. Rev. B Physical Review B 89.12 (2014). http://dx.doi.org/10.1103/PhysRevB.89.125427