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

被引:6
作者
Piccinini, Giulia [1 ,2 ]
Miseikis, Vaidotas [2 ,3 ]
Novelli, Pietro [4 ]
Watanabe, Kenji [5 ]
Taniguchi, Takashi [6 ]
Polini, Marco [3 ,7 ]
Coletti, Camilla [2 ,3 ]
Pezzini, Sergio [8 ,9 ]
机构
[1] Scuola Normale Super Pisa, NEST, I-56127 Pisa, Italy
[2] Ist Italiano Tecnol, Ctr Nanotechnol Innovat NEST, I-56127 Pisa, Italy
[3] Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy
[4] Ist Italiano Tecnol, I-16152 Genoa, Italy
[5] Natl Inst Mat Sci, Res Ctr Funct Mat, Tsukuba 3050044, Japan
[6] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba 3050044, Japan
[7] Dipartimento Fis, Univ Pisa, I-56127 Pisa, Italy
[8] Ist Nanosci, NEST, CNR, I-56127 Pisa, Italy
[9] Scuola Normale Super Pisa, I-56127 Pisa, Italy
关键词
Twisted bilayer graphene; chemical vapor deposition; van der Waals assembly; moire superlattice; DIRAC FERMIONS; SUPERCONDUCTIVITY; CRYSTALS; STATES;
D O I
10.1021/acs.nanolett.2c01114
中图分类号
O6 [化学];
学科分类号
0703 ;
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 moire potential. Via low-temperature dual-gated magnetotransport, we demonstrate the hallmarks of a 2.4 degrees-twisted superlattice, including tunable regimes of interlayer coupling, reduced Fermi velocity, large interlayer capacitance, and density-independent Brown-Zak oscillations. The observation of these moire-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.
引用
收藏
页码:5252 / 5259
页数:8
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