The recent introduction of superlattice potentials has opened new avenues for engineering tunable electronic band structures featuring topologically nontrivial moiré-like bands. Here we consider the optoelectronic properties of Bernal-stacked graphene subjected to a superlattice potential, which is introduced either electrostatically or through lattice twisting, to show that it exhibits a giant shift-current response that is orders of magnitude larger than existing predictions in twisted multilayer systems. Effects of a gate voltage and the strength and phase of the superlattice potential on the shift current are delineated systematically across various topological regimes. Our study gives insight into the nature of nonlinear responses of materials and how these responses could be optimized by tuning the superlattice potential.

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• Optical conductivity
• Optoelectronics
• Second order nonlinear optical processes
• Shift current