The authors demonstrate a graphene/CrSBr heterostructure exhibiting anisotropic surface plasmon polariton (SPP) propagation in the mid-infrared and terahertz range. Charge transfer at the interface directs SPPs along the quasi-1D chains that compose each CrSBr layer, with propagation lengths varying by an order of magnitude between the two in-plane crystallographic axes.
- Daniel J. Rizzo
- Eric Seewald
- D. N. Basov