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arXiv 2203.15422cond-mat.mes-hall
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基于CVD的小角度扭曲双层石墨烯的莫尔输运

Moiré-Induced Transport in CVD-Based Small-Angle Twisted Bilayer Graphene

Giulia Piccinini, Vaidotas Mišeikis, Pietro Novelli, Kenji Watanabe, Takashi Taniguchi, Marco Polini, Camilla Coletti, Sergio Pezzini

摘要:

为了实现2D双电子器件的应用潜力,可扩展的合成和组装技术需要满足界面清洁度和扭转角均匀性方面的严格要求。在这里,我们表明,小角度扭曲的双层石墨烯组装从单独的CVD生长的石墨烯单晶可以确保高品质的传输特性,由设备规模的均匀莫尔电位。通过低温双栅极磁输运,我们展示了一个$2.4^\circ$扭曲超晶格的特点,包括层间耦合,降低费米速度,大的层间电容,和密度无关的布朗-扎克振荡的可调制度。这些莫尔感应电传输特征的观察建立了基于CVD的扭曲双层石墨烯作为基础研究的“撕裂和堆叠”剥离薄片的替代品,同时作为未来大规模组装的概念验证。

英文摘要:

To realize the applicative potential of 2D twistronic devices, scalable synthesis and assembly techniques need to meet stringent requirements in terms of interface cleanness and twist-angle homogeneity. Here, we show that small-angle twisted bilayer graphene assembled from separated CVD-grown graphene single-crystals can ensure high-quality transport properties, determined by a device-scale-uniform moireé potential. Via low-temperature dual-gated magnetotransport, we demonstrate the hallmarks of a $2.4^\circ$ -twisted superlattice, including tunable regimes of interlayer coupling, reduced Fermi velocity, large interlayer capacitance, and density-independent Brown-Zak oscillations. The observation of these moiré-induced electrical transport features establishes CVD-based twisted bilayer graphene as an alternative to 'tear-and-stack' exfoliated flakes for fundamental studies, while serving as a proof-of-concept for future large-scale assembly.

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