Manipulating Superlattice Potentials and Quantum Confinement in Graphene via Moiré Ferroelectricity

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-07-16 DOI:10.1021/acs.nanolett.5c01976

Zi-Han Guo, Chao Yan, Jia-Qi He, Ke Lv, Kenji Watanabe, Takashi Taniguchi, Ya-Ning Ren* and Lin He*,

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Abstract

Two-dimensional (2D) moiré ferroelectricity has recently garnered significant attention as a bottom-up approach to realizing ferroelectrics via van der Waals assembly. Besides the interesting ferroelectricity, the periodic electric fields of 2D ferroelectricity offer unprecedented opportunities to modulate the electronic properties of adjacent 2D materials. However, direct local characterization of this effect, essential for a deep understanding and application of the moiré ferroelectricity, is still lacking. Here, we utilize twisted hexagonal boron nitride (t-hBN) as a moiré ferroelectric substrate to tune the electrical properties of its overlying graphene. Using scanning tunneling microscopy (STM), we demonstrate with nanoscale spatial resolution that the t-hBN moiré ferroelectricity generates periodic potential in graphene to confine massless Dirac fermions. Our experiment further indicates that we can reversibly alter the ferroelectric polarizations around the t-hBN moiré boundaries via the STM tip. This tunability of adjacent material properties opens new avenues for advanced heterostructures and devices based on 2D moiré ferroelectricity.

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利用莫尔铁电性操纵石墨烯中的超晶格势和量子约束。

作为一种自下而上的通过范德华组装实现铁电体的方法，二维（2D）莫尔铁电体最近引起了人们的极大关注。除了有趣的铁电性外，二维铁电性的周期性电场为调制相邻二维材料的电子特性提供了前所未有的机会。然而，这种效应的直接局部表征，对于深入理解和应用微波铁电性至关重要，仍然缺乏。在这里，我们利用扭曲六方氮化硼（t-hBN）作为涡流铁电衬底来调节其上覆石墨烯的电学特性。利用扫描隧道显微镜（STM），我们以纳米尺度的空间分辨率证明了t-hBN摩尔铁电在石墨烯中产生周期势，以限制无质量的狄拉克费米子。我们的实验进一步表明，我们可以通过STM尖端可逆地改变t-hBN摩尔边界周围的铁电极化。这种相邻材料特性的可调性为基于二维摩尔铁电的先进异质结构和器件开辟了新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.