Engineering band structures of two-dimensional materials with remote moiré ferroelectricity

Jing Ding; Hanxiao Xiang; Wenqiang Zhou; Naitian Liu; Qianmei Chen; Xinjie Fang; Kangyu Wang; Linfeng Wu; Kenji Watanabe; Takashi Taniguchi; Na Xin; Shuigang Xu

doi:10.1038/s41467-024-53440-w

論文 Engineering band structures of two-dimensional materials with remote moiré ferroelectricity

Jing Ding ; Hanxiao Xiang ; Wenqiang Zhou ; Naitian Liu ; Qianmei Chen ; Xinjie Fang ; Kangyu Wang ; Linfeng Wu ; Kenji Watanabe ; Takashi Taniguchi ; Na Xin ; Shuigang Xu

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Jing Ding, Hanxiao Xiang, Wenqiang Zhou, Naitian Liu, Qianmei Chen, Xinjie Fang, Kangyu Wang, Linfeng Wu, Kenji Watanabe, Takashi Taniguchi, Na Xin, Shuigang Xu. Engineering band structures of two-dimensional materials with remote moiré ferroelectricity. Nature Communications. 2024, 15 (1), 9087. https://doi.org/10.1038/s41467-024-53440-w

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(abstract)

The stacking order and twist angle provide abundant opportunities for engineering band structures of two-dimensional materials, including the formation of moiré bands, flat bands, and topologically nontrivial bands. The inversion symmetry breaking in rhombohedral-stacked transitional metal dichalcogenides (TMDCs) endows them with an interfacial ferroelectricity associated with an out-of-plane electric polarization. By utilizing twist angle as a knob to construct rhombohedral-stacked TMDCs, antiferroelectric domain networks with alternating out-of-plane polarization can be generated. Here, we demonstrate that such spatially periodic ferroelectric polarizations in parallel-stacked twisted WSe2 can imprint their moiré potential onto a remote bilayer graphene. This remote moiré potential gives rise to pronounced satellite resistance peaks besides the charge-neutrality point in graphene, which are tunable by the twist angle of WSe2. Our observations of ferroelectric hysteresis at finite displacement fields suggest the moiré is delivered by a long-range electrostatic potential. The constructed superlattices by moiré ferroelectricity represent a highly flexible approach, as they involve the separation of the moiré construction layer from the electronic transport layer. This remote moiré is identified as a weak potential and can coexist with conventional moiré. Our results offer a comprehensive strategy for engineering band structures and properties of two-dimensional materials by utilizing moiré ferroelectricity.

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