Correlation and topology in special-stacked multilayer graphene

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Multiple stacking sequences between atomic layers provide a unique knob for tuning electronic properties of two-dimensional materials. In this talk, I will take graphene as an example and show our experimental results of graphene multilayers in special stackings. Experimental advances allow us to fabricate high-quality special stacked multilayer graphene devices encapsulated by hBN. By electrical transport measurement, we study two different stacking sequences, rhombohedral stacking and mixed-stacking. In rhombohedral multilayer graphene, we observe a series of correlated and topological electronic states with spontaneous broken-symmetries in the crystalline and moir flat band. For the mixed stacking, we find a non-centrosymmetric multilayer graphene, and observe transport signatures of intrinsic layer polarization and multi-flat bands.

References:
1.Kai Liu et al, Nature Nanotechnology, 19, 188-195 (2024)
2.Yating Sha et al, Science,384, 141-149 (2024)
3.Jian Zheng et al, arXiv:2412.09985
4.Kai Liu et al, arXiv:2505.12478

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