Electronic confinement induced quantum dot behavior in magic-angle twisted bilayer graphene†

IF 5.8 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Nanoscale Pub Date : 2024-12-23 DOI:10.1039/D4NR02824D
Bhaskar Ghawri, Pablo Bastante, Kenji Watanabe, Takashi Taniguchi, Michel Calame, Mickael L. Perrin and Jian Zhang
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引用次数: 0

Abstract

Magic-angle twisted bilayer graphene (TBLG) has emerged as a versatile platform to explore correlated electron phases driven primarily by low-energy flat bands in moiré superlattices. While techniques for controlling the twist angle between graphene layers have spurred rapid experimental progress, understanding the effects of doping inhomogeneity on electronic transport in correlated electron systems remains challenging. In this work, we investigate the interplay of confinement and doping inhomogeneity on the electrical transport properties of TBLG by leveraging device dimensions and twist angles. We show that reducing device dimensions can magnify disorder potentials caused by doping inhomogeneity, resulting in pronounced carrier confinement. This phenomenon is evident in charge transport measurements, where the Coulomb blockade effect is observed. Temperature-dependent measurements reveal a large variation in the activation gap across the device. These findings highlight the critical role of doping inhomogeneity in TBLG and its significant impact on the transport properties of the system.

Abstract Image

电子约束诱导魔角扭曲双层石墨烯量子点行为
魔角扭曲双层石墨烯(TBLG)已成为一个多功能平台,用于探索主要由摩尔超晶格中低能平带驱动的相关电子相。虽然控制石墨烯层间扭角的技术已经推动了实验的快速进展,但了解掺杂不均匀性对相关电子系统中电子输运的影响仍然具有挑战性。在这项工作中,我们通过利用器件尺寸和扭转角来研究约束和掺杂不均匀性对TBLG电输运性质的相互作用。我们发现减小器件尺寸可以放大由掺杂不均匀性引起的无序势,导致明显的载流子限制。这种现象在电荷输运测量中很明显,在那里观察到库仑封锁效应。温度相关的测量结果显示,整个器件的激活间隙变化很大。这些发现强调了掺杂不均匀性在TBLG中的关键作用及其对系统输运性质的重大影响。
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来源期刊
Nanoscale
Nanoscale CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
12.10
自引率
3.00%
发文量
1628
审稿时长
1.6 months
期刊介绍: Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.
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