Exciton-exciton annihilation in MoSe2 monolayers

By Nardeep Kumar, Q. Cui, F. Ceballos, D. He, Yongsheng Wang, Hui Zhao. 2013

273 citations recorded by the source corpus.

We investigate the excitonic dynamics in MoSe2 monolayer and bulk samples by femtosecond transient absorption microscopy. Excitons are resonantly injected by a 750-nm and 100-fs laser pulse, and are detected by a probe pulse tuned in the range of 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 the bulk under comparable conditions. We also observe the saturated absorption induced by exciton phase-space filling in both monolayers and the bulk, which indicates their potential applications as saturable absorbers.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ed0fc77ffece1e2434513f3eb4805b073d2f8a8d

How researchers see this paper

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In Electrical and Electronic Engineering

1. Hongyi Yu
2. Xiaodong Xu
3. W. Yao
4. X. Cui

In Materials Chemistry

1. Hongyi Yu
2. W. Yao
3. Xiaodong Xu
4. X. Cui
5. K. Mak
6. J. Shan
7. Di Xiao

Citations in the corpus

• Valley excitons in two-dimensional semiconductors (2015, background): “From the energy splitting, the trion charging energy 𝐸𝑐 is determined to be 18 meV [15], 30 meV [14], 20-40 meV [51] and 30 meV [13] in monolayer MoS2, MoSe2, WS2 and WSe2 respectively.”
• Tunable nonlinear refractive index of two-dimensional MoS 2 , WS 2 , and MoSe 2 nanosheet dispersions [Invited] (2015, unknown): “absorption coefficients and thermal conductivities [8,22–24].”