The role of Excitons in Nonlinear Optics: Forming Tightly Bound Pairs
Excitons play a crucial role in nonlinear optics, as they are responsible for the formation of tightly bound pairs of electrons and holes. In WSe2, the reduced dimensionality of the material leads to strong electrostatic interactions, resulting in the formation of stable excitons at room temperature. These excitons are the key to the giant nonlinear optical response observed in the device. The excitons' ability to form tightly bound pairs enables the manipulation of light, allowing for the processing of information with unprecedented efficiency.