Active Light Control of the MoS2 Monolayer Exciton Binding Energy

ACS Nano
Ziwei LiZheyu Fang

Abstract

Plasmonic excitation of Au nanoparticles deposited on a MoS2 monolayer changes the absorption and photoluminescence characteristics of the material. Hot electrons generated from the Au nanoparticles are transferred into the MoS2 monolayers, resulting in n-doping. The doping effect of plasmonic hot electrons modulates the dielectric permittivity of materials, resulting in a red shift of both the absorption and the photoluminescence spectrum. This spectroscopic tuning was further investigated experimentally by using different Au nanoparticle concentrations, excitation laser wavelengths, and intensities. An analytical model for the photoinduced modulation of the MoS2 dielectric function and its exciton binding energy change is developed and used to estimate the doping density of plasmonic hot electrons. Our approach is important for the development of photonic devices for active control of light by light.

References

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Citations

Dec 15, 2015·Nano Letters·Hossein Shokri KojoriSung Jin Kim
Nov 3, 2016·Nano Letters·Yuan LiVinayak P Dravid
Nov 15, 2016·Scientific Reports·Dilna AzhikodanSangeeta Sharma
Nov 9, 2017·Physical Chemistry Chemical Physics : PCCP·S WiegholdF Esch
May 23, 2018·Advanced Materials·Zhi-Qian WuShi-Sheng Lin
Jan 9, 2018·Nanoscale·Alexander G MilekhinDietrich R T Zahn
Aug 16, 2017·Nanoscale Research Letters·Byoung Ki ChoiYoung Jun Chang
Sep 28, 2017·Physical Review Letters·Pranjal Kumar GogoiAndrew T S Wee
Jun 30, 2017·Light, Science & Applications·Pierfrancesco ZilioFrancesco de Angelis
Dec 8, 2016·Nanoscale Research Letters·Junku LiuShoushan Fan
Jan 13, 2021·Small·Tong YeDehui Li
Jan 18, 2018·Nano Letters·Xiaotian ZhangJoan M Redwing

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