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 and Shuigang Xu ()
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Jing Ding: Fudan University
Hanxiao Xiang: Fudan University
Wenqiang Zhou: Westlake University
Naitian Liu: Fudan University
Qianmei Chen: Zhejiang University
Xinjie Fang: Fudan University
Kangyu Wang: Fudan University
Linfeng Wu: Fudan University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Na Xin: Zhejiang University
Shuigang Xu: Westlake University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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 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 transitional metal dichalcogenides, 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.

Date: 2024
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DOI: 10.1038/s41467-024-53440-w

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