Optical polarization in mono and bilayer MoS2

Optical anisotropy in monolayer- and bilayer-MoS2 was investigated by polarization resolved photoluminescence measurements. The photoluminescence of monolayer-MoS2 is found to be partially polarized at 4.2 K and maintains this polarization characteristic up to room temperature, while the photolumine...

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Bibliographic Details
Published in:Current applied physics 2017, 17(9), , pp.1153-1157
Main Authors: Park, Youngsin, Li, Nannan, Chan, Christopher C.S., Reid, Benjamin P.L., Taylor, Robert A., Im, Hyunsik
Format: Article
Language:English
Subjects:
Charge distribution
Density functional theory
MoS2
Photoluminescence
Polarization
물리학
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Summary:Optical anisotropy in monolayer- and bilayer-MoS2 was investigated by polarization resolved photoluminescence measurements. The photoluminescence of monolayer-MoS2 is found to be partially polarized at 4.2 K and maintains this polarization characteristic up to room temperature, while the photoluminescence of bilayer-MoS2 shows no obvious polarization. This polarization anisotropy is due to strain effects at the interface between the MoS2 layer and the SiO2 substrate, causing symmetry breaking of the MoS2 charge distribution. Calculations using density functional theory of the electron density distribution of the monolayer- and bilayer-MoS2 in the in-plane direction are also presented, giving support to our qualitative analysis. •Optical anisotropy in 1L- and 2L-MoS2 is investigated by photoluminescence measurements.•This polarization anisotropy is due to strain effects at the MoS2/SiO2 interface.•Calculated electron density distribution of the 1L- and 2L-MoS2 in the in-plane direction is presented.
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2017.05.009