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Intrinsic nonlinear Hall effect and gate-switchable Berry curvature sliding in twisted bilayer graphene

Meizhen HuangZefei WuXu Zhang ...+7 Ning Wang
Dec 2022
摘要
Though the observation of quantum anomalous Hall effect and nonlocaltransport response reveals nontrivial band topology governed by the Berrycurvature in twisted bilayer graphene, some recent works reported nonlinearHall signals in graphene superlattices which are caused by the extrinsicdisorder scattering rather than the intrinsic Berry curvature dipole moment. Inthis work, we report a Berry curvature dipole induced intrinsic nonlinear Halleffect in high-quality twisted bilayer graphene devices. We also find that theapplication of the displacement field substantially changes the direction andamplitude of the nonlinear Hall voltages, as a result of a field-inducedsliding of the Berry curvature hotspots. Our work not only proves that theBerry curvature dipole could play a dominant role in generating the intrinsicnonlinear Hall signal in graphene superlattices with low disorder densities,but also demonstrates twisted bilayer graphene to be a sensitive andfine-tunable platform for second harmonic generation and rectification.
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