Fig. 1: Schematic of charge transfer and uniaxial plasmon polariton propagation in graphene/CrSBr heterostructures.
From: Engineering anisotropic electrodynamics at the graphene/CrSBr interface
A Overview of s-SNOM measurements in graphene/CrSBr heterostructures. The difference in work functions between these layers leads to hole-doped graphene and electron-doped CrSBr. Uniaxial surface plasmon polaritons (SPPs) are generated upon illumination of the AFM tip with mid-infrared (MIR) light. B CrSBr displays a highly anisotropic crystal structure, forming 1D chains along the in-plane a-axis. The resulting electronic structure is quasi-1D, with b-axis carriers possessing a much higher mobility than a-axis carriers. Proximate interactions between graphene SPPs and electron-hole excitations in the underlying CrSBr leads to preferential SPP propagation along the 1D a-axis chains.
