  Though the observation of the quantum anomalous Hall effect and nonlocal
transport response reveals nontrivial band topology governed by the Berry
curvature in twisted bilayer graphene, some recent works reported nonlinear
Hall signals in graphene superlattices that are caused by the extrinsic
disorder scattering rather than the intrinsic Berry curvature dipole moment. In
this work, we report a Berry curvature dipole induced intrinsic nonlinear Hall
effect in high-quality twisted bilayer graphene devices. We also find that the
application of the displacement field substantially changes the direction and
amplitude of the nonlinear Hall voltages, as a result of a field-induced
sliding of the Berry curvature hotspots. Our work not only proves that the
Berry curvature dipole could play a dominant role in generating the intrinsic
nonlinear Hall signal in graphene superlattices with low disorder densities,
but also demonstrates twisted bilayer graphene to be a sensitive and
fine-tunable platform for second harmonic generation and rectification.
