Fig. 2: Controlling excitonic intensities using nanopatterning of thin film WSe2.
From: Flat dispersion at large momentum transfer at the onset of exciton polariton formation
a High-angle annular dark-field (HAADF) image showing a thin film WSe2 with cuts (arrows) from helium ion microscopy (black = vacuum, darkest grey = thinnest region to lightest grey = thickest region). b Nanoscale map of A excitonic intensity from STEM-EELS, generated by integrating the spectral intensity in arbitrary units (au) over the A excitonic energy-loss peak (dark purple = lowest A excitonic intensity, yellow-white = highest A excitonic intensity). c Individual EEL spectra showing the signature from A and B excitonic peaks from a reference region as well as from various positions around the cuts as shown in (b). d Intensity profiles of the A and B excitonic peaks across the cut region (annotated with boxed region in (b)) show that the intensity of the A and the B exciton peaks are enhanced around the cuts.
