Single-Carrier Transport in Graphene/hBN Superlattices,Nano Letters

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Single-Carrier Transport in Graphene/hBN Superlattices
Nano Letters ( IF 9.6 ) Pub Date : 2020-03-18 , DOI: 10.1021/acs.nanolett.9b05332
Takuya Iwasaki _{1,

2} , Shu Nakaharai ₂ , Yutaka Wakayama ₂ , Kenji Watanabe ₃ , Takashi Taniguchi ₃ , Yoshifumi Morita ₄ , Satoshi Moriyama ₂

Affiliation

Graphene/hexagonal boron nitride (hBN) moiré superlattices have attracted interest for use in the study of many-body effects and fractal physics in Dirac fermion systems. Many exotic transport properties have been intensively examined in such superlattices, but previous studies have not focused on single-carrier transport. The investigation of the single-carrier behavior in these superlattices would lead to an understanding of the transition of single-particle/correlated phenomena. Here, we show the single-carrier transport in a high-quality bilayer graphene/hBN superlattice-based quantum dot device. We demonstrate remarkable device controllability in the energy range near the charge neutrality point (CNP) and the hole-side satellite point. Under a perpendicular magnetic field, Coulomb oscillations disappear near the CNP, which could be a signature of the crossover between Coulomb blockade and quantum Hall regimes. Our results pave the way for exploring the relationship of single-electron transport and fractal quantum Hall effects with correlated phenomena in two-dimensional quantum materials.

中文翻译：

石墨烯/ hBN超晶格中的单载体传输

石墨烯/六方氮化硼（hBN）莫尔超晶格已经引起人们的兴趣，用于研究狄拉克费米子系统中的多体效应和分形物理。在这种超晶格中已经对许多奇异的运输性质进行了深入研究，但是以前的研究并未集中在单载体运输上。对这些超晶格中单载体行为的研究将导致对单粒子/相关现象过渡的理解。在这里，我们展示了基于高质量双层石墨烯/ hBN超晶格的量子点器件中的单载流子传输。我们展示了在电荷中性点（CNP）和空穴侧卫星点附近的能量范围内出色的设备可控性。在垂直磁场下，CNP附近的库仑振荡消失，这可能是库仑封锁与量子霍尔政权交叉的标志。我们的结果为探索单电子传输和分形量子霍尔效应与二维量子材料中相关现象的关系铺平了道路。

更新日期：2020-04-24

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