Electronic and Optoelectronic Technologies (IMAGE)
Caption
Upper Panel: schematic of optical excitation in the K valley of WS2 monolayers. Lower Panel: Photoluminescence (PL) intensity map of a triangular monolayer island of WS2 and the associated valley polarization map demonstrate the clear inverse relationship. Each map covers a 46 x 43 micron area. The regions exhibiting smallest PL intensity and lowest quality are found at the center of the flake and radiate outward toward the three corners. These regions correspond to the highest valley polarization.
Credit
US Naval Research Laboratory
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