Nature Communications (Mar 2021)
Twist-angle engineering of excitonic quantum interference and optical nonlinearities in stacked 2D semiconductors
Abstract
Here, the authors report on the large twist-angle susceptibility of excitons involving upper conduction bands in transition metal dichalcogenide bilayers. These high-lying excitons couple with band-edge excitons, and give rise to nonlinear quantum-optical processes that become tuneable by twisting.