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Project Summary: Transition metal dichalcogenide monolayers such as WS2 provide a platform for the production of diverse
device functionalities through doping. For example, the transition metal vanadium, when substituted on the WS2 lattice, produces a
dilute 2D magnetic semiconductor with room-temperature ferromagnetic ordering. This study performs the first broadband
optical characterization of its electronic band structure and dependence on vanadium concentration. Power-dependent
photoluminescence, resonant four-wave mixing, and differential reflectance spectroscopies reveal new optical transitions from a
donor-like level to spin-polarized conduction band minima while resonant Raman and second-harmonic generation reveal a
blueshift in the B exciton under vanadium doping. Density functional theory calculations reveal candidates for the new
photoluminescence peaks and elucidate the role of spin polarization
Sousa, Zheng, Liu, Resende, Zhou, Pimenta, Terrones, Crespi
and Malard, Adv. Optical Mater. 12, 2400235 (2024)
10.1002/adom.202400235
2DCC Role: The Theory/Simulation/Data facility provided
expertise in the magnetooptical response of 2D materials working
in concert with international collaborators.