Quantum geometry and nonlinear optical responses in rhombohedral trilayer graphene

Multilayered graphene systems provide a highly tunable platform to study quantum geometric effects. Here, the authors show that the quantum geometry of electronic bands in rhombohedral trilayer graphene leads to a large shift-current response which can be tuned by applying a displacement field perpendicular to the layers. The authors compare the response with Bernal stacked bilayer graphene and find additional features arising due to the confluence of quantum geometry and the multiband nature of rhombohedral trilayer graphene.