Enhanced photo-excitation and angular-momentum imprint of gray excitons in WSe${}_2$ monolayers by spin-orbit-coupled vector vortex beams

Oscar Javier Gomez Sanchez, Guan-Hao Peng, Wei-Hua Li +3

A light beam can be spatially structured in the complex amplitude to possess orbital angular momentum (OAM), which introduces a new degree of freedom alongside the intrinsic spin a…