挠曲电
超晶格
铁电性
材料科学
凝聚态物理
堆积
异质结
极化(电化学)
范德瓦尔斯力
电场
光电子学
电介质
物理
核磁共振
化学
物理化学
量子力学
分子
作者
Siyuan Wan,Hui Huang,Huanlin Liu,Heng Liu,Zhi-xiong Li,Y. D. Li,Zhi‐Min Liao,Mario Lanza,Hualing Zeng,Yangbo Zhou
标识
DOI:10.1002/adma.202410563
摘要
Abstract Moiré superlattices in twisted van der Waals homo/heterostructures present a fascinating interplay between electronic and atomic structures, with potential applications in electronic and optoelectronic devices. Flexoelectricity, an electromechanical coupling between electric polarization and strain gradient, is intrinsic to these superlattices because of the lattice misfit strain at the atomic scale. However, due to its weak magnitude, the effect of flexoelectricity on moiré ferroelectricity has remained underexplored. Here, the role of flexoelectricity in shaping and modulating the moiré ferroelectric patterns in twisted hBN homojunction is unveiled. Enhanced flexoelectric effects induce unique stacking ferroelectric domains with hollow triangular structures. Interlayer bubbles influence domain shape and periodicity through local electric field modulation, and tip‐stress enables the reversible manipulation of domain area and polarization direction. These findings highlight the impact of flexoelectric effects on moiré ferroelectricity, offering a new tuning knob for its manipulation.
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