Photo by jaimedantas from unsplash
Abstract Optical anisotropy in monolayer- and bilayer-MoS 2 was investigated by polarization resolved photoluminescence measurements. The photoluminescence of monolayer-MoS 2 is found to be partially polarized at 4.2 K and maintains… Click to show full abstract
Abstract Optical anisotropy in monolayer- and bilayer-MoS 2 was investigated by polarization resolved photoluminescence measurements. The photoluminescence of monolayer-MoS 2 is found to be partially polarized at 4.2 K and maintains this polarization characteristic up to room temperature, while the photoluminescence of bilayer-MoS 2 shows no obvious polarization. This polarization anisotropy is due to strain effects at the interface between the MoS 2 layer and the SiO 2 substrate, causing symmetry breaking of the MoS 2 charge distribution. Calculations using density functional theory of the electron density distribution of the monolayer- and bilayer-MoS 2 in the in-plane direction are also presented, giving support to our qualitative analysis.
Journal Title: Current Applied Physics
Year Published: 2017
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!