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Nonlocal exciton emission in the two-dimensional material WS2 is an important indicator of dynamics of the system. Spectral shift of the emission is also important, as it indicates regions with different bandgaps, and a smaller bandgap region can 'trap' excitons. We observe both at once using a CCD readout on a spectrometer in which 1D spectral together with 1D spatial measurements are performed. Back-propagation of the slit to the sample indicates the Photo Luminescent (PL) emission region around the excitation spot. A dove prism allows effective rotation of the slit. Quantitative analysis of the spectral and spatial dynamics is discussed.
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Hans D. Hallen, Landon Hernandez, Da Zhou, Mauricio Terrones, Zhiwen Liu, "Nonlocal exciton dynamics in monolayer WS_2," Proc. SPIE PC12228, Ultrafast Nonlinear Imaging and Spectroscopy X, PC1222803 (3 October 2022); https://doi.org/10.1117/12.2635671